diff --git a/java/src/com/android/inputmethod/latin/AbstractDictionaryWriter.java b/java/src/com/android/inputmethod/latin/AbstractDictionaryWriter.java
index e6fb980..1aee22b 100644
--- a/java/src/com/android/inputmethod/latin/AbstractDictionaryWriter.java
+++ b/java/src/com/android/inputmethod/latin/AbstractDictionaryWriter.java
@@ -21,7 +21,7 @@
 
 import com.android.inputmethod.latin.makedict.DictEncoder;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
+import com.android.inputmethod.latin.makedict.Ver2DictEncoder;
 
 import java.io.File;
 import java.io.IOException;
@@ -64,7 +64,7 @@
         final String tempFilePath = file.getAbsolutePath() + ".temp";
         final File tempFile = new File(tempFilePath);
         try {
-            final DictEncoder dictEncoder = new Ver3DictEncoder(tempFile);
+            final DictEncoder dictEncoder = new Ver2DictEncoder(tempFile);
             writeDictionary(dictEncoder, attributeMap);
             tempFile.renameTo(file);
         } catch (IOException e) {
diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index db4234c..95ac3e2 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -367,6 +367,7 @@
     public static class LanguageModelParam {
         public final int[] mWord0;
         public final int[] mWord1;
+        // TODO: this needs to be a list of shortcuts
         public final int[] mShortcutTarget;
         public final int mUnigramProbability;
         public final int mBigramProbability;
@@ -375,7 +376,7 @@
         public final boolean mIsBlacklisted;
         public final int mTimestamp;
 
-        // Constructor for unigram.
+        // Constructor for unigram. TODO: support shortcuts
         public LanguageModelParam(final String word, final int unigramProbability,
                 final int timestamp) {
             mWord0 = null;
diff --git a/java/src/com/android/inputmethod/latin/DictionaryWriter.java b/java/src/com/android/inputmethod/latin/DictionaryWriter.java
index f960c53..89ef96d 100644
--- a/java/src/com/android/inputmethod/latin/DictionaryWriter.java
+++ b/java/src/com/android/inputmethod/latin/DictionaryWriter.java
@@ -18,8 +18,6 @@
 
 import android.content.Context;
 
-import com.android.inputmethod.keyboard.ProximityInfo;
-import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.makedict.DictEncoder;
 import com.android.inputmethod.latin.makedict.FormatSpec;
 import com.android.inputmethod.latin.makedict.FusionDictionary;
@@ -52,7 +50,7 @@
     public void clear() {
         final HashMap<String, String> attributes = CollectionUtils.newHashMap();
         mFusionDictionary = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(attributes, false, false));
+                new FusionDictionary.DictionaryOptions(attributes));
     }
 
     /**
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index 6a10131..0f7263d 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -100,7 +100,6 @@
 import com.android.inputmethod.latin.utils.StringUtils;
 import com.android.inputmethod.latin.utils.TargetPackageInfoGetterTask;
 import com.android.inputmethod.latin.utils.TextRange;
-import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils;
 import com.android.inputmethod.research.ResearchLogger;
 
 import java.io.FileDescriptor;
@@ -1019,11 +1018,6 @@
             // Only for debug
             mBoostPersonalizationDictionaryForDebug =
                     currentSettingsValues.mBoostPersonalizationDictionaryForDebug;
-            if (mBoostPersonalizationDictionaryForDebug) {
-                UserHistoryForgettingCurveUtils.boostMaxFreqForDebug();
-            } else {
-                UserHistoryForgettingCurveUtils.resetMaxFreqForDebug();
-            }
         }
     }
 
diff --git a/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java b/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java
index bbbb8e4..f8fa68f 100644
--- a/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java
@@ -58,12 +58,9 @@
                 headerSize);
 
         final FileHeader header = new FileHeader(headerSize,
-                new FusionDictionary.DictionaryOptions(attributes,
-                        0 != (optionsFlags & FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG),
-                        0 != (optionsFlags & FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG)),
-                        new FormatOptions(version,
-                                0 != (optionsFlags & FormatSpec.SUPPORTS_DYNAMIC_UPDATE),
-                                0 != (optionsFlags & FormatSpec.CONTAINS_TIMESTAMP_FLAG)));
+                new FusionDictionary.DictionaryOptions(attributes),
+                new FormatOptions(version,
+                        0 != (optionsFlags & FormatSpec.CONTAINS_TIMESTAMP_FLAG)));
         return header;
     }
 
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java
index 83ee7d6..7f0aa77 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java
@@ -330,7 +330,7 @@
 
     static int readChildrenAddress(final DictBuffer dictBuffer,
             final int optionFlags, final FormatOptions options) {
-        if (options.mSupportsDynamicUpdate) {
+        if (options.supportsDynamicUpdate()) {
             final int address = dictBuffer.readUnsignedInt24();
             if (address == 0) return FormatSpec.NO_CHILDREN_ADDRESS;
             if ((address & FormatSpec.MSB24) != 0) {
@@ -540,11 +540,11 @@
             }
 
             // reach the end of the array.
-            if (options.mSupportsDynamicUpdate) {
+            if (options.supportsDynamicUpdate()) {
                 final boolean hasValidForwardLink = dictDecoder.readAndFollowForwardLink();
                 if (!hasValidForwardLink) break;
             }
-        } while (options.mSupportsDynamicUpdate && dictDecoder.hasNextPtNodeArray());
+        } while (options.supportsDynamicUpdate() && dictDecoder.hasNextPtNodeArray());
 
         final PtNodeArray nodeArray = new PtNodeArray(nodeArrayContents);
         nodeArray.mCachedAddressBeforeUpdate = nodeArrayOriginPos;
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
index c0dad3d..8ba0797 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
@@ -20,7 +20,6 @@
 import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
-import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
 
@@ -161,7 +160,7 @@
             node.mCachedSize = nodeSize;
             size += nodeSize;
         }
-        if (options.mSupportsDynamicUpdate) {
+        if (options.supportsDynamicUpdate()) {
             size += FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
         }
         ptNodeArray.mCachedSize = size;
@@ -398,7 +397,7 @@
                     nodeSize += FormatSpec.PTNODE_FREQUENCY_SIZE;
                 }
             }
-            if (formatOptions.mSupportsDynamicUpdate) {
+            if (formatOptions.supportsDynamicUpdate()) {
                 nodeSize += FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
             } else if (null != ptNode.mChildren) {
                 nodeSize += getByteSize(getOffsetToTargetNodeArrayDuringUpdate(ptNodeArray,
@@ -418,7 +417,7 @@
             ptNode.mCachedSize = nodeSize;
             size += nodeSize;
         }
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             size += FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
         }
         if (ptNodeArray.mCachedSize != size) {
@@ -534,7 +533,7 @@
             if (passes > MAX_PASSES) throw new RuntimeException("Too many passes - probably a bug");
         } while (changesDone);
 
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             computeParentAddresses(flatNodes);
         }
         final PtNodeArray lastPtNodeArray = flatNodes.get(flatNodes.size() - 1);
@@ -643,7 +642,7 @@
         byte flags = 0;
         if (hasMultipleChars) flags |= FormatSpec.FLAG_HAS_MULTIPLE_CHARS;
         if (isTerminal) flags |= FormatSpec.FLAG_IS_TERMINAL;
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             flags |= FormatSpec.FLAG_IS_NOT_MOVED;
         } else if (true) {
             switch (childrenAddressSize) {
@@ -755,16 +754,11 @@
     }
 
     /**
-     * Makes the 2-byte value for options flags.
+     * Makes the 2-byte value for options flags. Unused at the moment, and always 0.
      */
-    private static final int makeOptionsValue(final FusionDictionary dictionary,
-            final FormatOptions formatOptions) {
-        final DictionaryOptions options = dictionary.mOptions;
-        final boolean hasBigrams = dictionary.hasBigrams();
-        return (options.mFrenchLigatureProcessing ? FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG : 0)
-                + (options.mGermanUmlautProcessing ? FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG : 0)
-                + (hasBigrams ? FormatSpec.CONTAINS_BIGRAMS_FLAG : 0)
-                + (formatOptions.mSupportsDynamicUpdate ? FormatSpec.SUPPORTS_DYNAMIC_UPDATE : 0);
+    private static final int makeOptionsValue(final FormatOptions formatOptions) {
+        // TODO: why doesn't this handle CONTAINS_TIMESTAMP_FLAG?
+        return 0;
     }
 
     /**
@@ -852,7 +846,7 @@
             }
             dictEncoder.writePtNode(ptNode, parentPosition, formatOptions, dict);
         }
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             dictEncoder.writeForwardLinkAddress(FormatSpec.NO_FORWARD_LINK_ADDRESS);
         }
         if (dictEncoder.getPosition() != ptNodeArray.mCachedAddressAfterUpdate
@@ -953,7 +947,7 @@
         headerBuffer.write((byte) (0xFF & version));
 
         // Options flags
-        final int options = makeOptionsValue(dict, formatOptions);
+        final int options = makeOptionsValue(formatOptions);
         headerBuffer.write((byte) (0xFF & (options >> 8)));
         headerBuffer.write((byte) (0xFF & options));
         final int headerSizeOffset = headerBuffer.size();
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
index 86ebf58..640d778 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
@@ -112,7 +112,7 @@
             }
 
             if (p.mPosition == p.mNumOfPtNode) {
-                if (formatOptions.mSupportsDynamicUpdate) {
+                if (formatOptions.supportsDynamicUpdate()) {
                     final boolean hasValidForwardLinkAddress =
                             dictDecoder.readAndFollowForwardLink();
                     if (hasValidForwardLinkAddress && dictDecoder.hasNextPtNodeArray()) {
@@ -228,7 +228,7 @@
                 // a forward link address that we need to consult and possibly resume
                 // search on the next node array in the linked list.
                 if (foundNextPtNode) break;
-                if (!header.mFormatOptions.mSupportsDynamicUpdate) {
+                if (!header.mFormatOptions.supportsDynamicUpdate()) {
                     return FormatSpec.NOT_VALID_WORD;
                 }
 
@@ -507,7 +507,7 @@
      * Helper method to check whether the node is moved.
      */
     public static boolean isMovedPtNode(final int flags, final FormatOptions options) {
-        return options.mSupportsDynamicUpdate
+        return options.supportsDynamicUpdate()
                 && ((flags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) == FormatSpec.FLAG_IS_MOVED);
     }
 
@@ -516,14 +516,14 @@
      */
     public static boolean supportsDynamicUpdate(final FormatOptions options) {
         return options.mVersion >= FormatSpec.FIRST_VERSION_WITH_DYNAMIC_UPDATE
-                && options.mSupportsDynamicUpdate;
+                && options.supportsDynamicUpdate();
     }
 
     /**
      * Helper method to check whether the node is deleted.
      */
     public static boolean isDeletedPtNode(final int flags, final FormatOptions formatOptions) {
-        return formatOptions.mSupportsDynamicUpdate
+        return formatOptions.supportsDynamicUpdate()
                 && ((flags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) == FormatSpec.FLAG_IS_DELETED);
     }
 
@@ -546,7 +546,7 @@
 
     static int getChildrenAddressSize(final int optionFlags,
             final FormatOptions formatOptions) {
-        if (formatOptions.mSupportsDynamicUpdate) return FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
+        if (formatOptions.supportsDynamicUpdate()) return FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
         switch (optionFlags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) {
             case FormatSpec.FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE:
                 return 1;
diff --git a/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java b/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java
index 971b4ff..97ad667 100644
--- a/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java
@@ -55,13 +55,13 @@
      * @param newParentAddress the absolute address of the parent.
      * @param formatOptions file format options.
      */
-    private static void updateParentAddress(final Ver3DictUpdater dictUpdater,
+    private static void updateParentAddress(final Ver2DictUpdater dictUpdater,
             final int ptNodeOriginAddress, final int newParentAddress,
             final FormatOptions formatOptions) {
         final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
         final int originalPosition = dictBuffer.position();
         dictBuffer.position(ptNodeOriginAddress);
-        if (!formatOptions.mSupportsDynamicUpdate) {
+        if (!formatOptions.supportsDynamicUpdate()) {
             throw new RuntimeException("this file format does not support parent addresses");
         }
         final int flags = dictBuffer.readUnsignedByte();
@@ -88,7 +88,7 @@
      * @param newParentAddress the address to be written.
      * @param formatOptions file format options.
      */
-    private static void updateParentAddresses(final Ver3DictUpdater dictUpdater,
+    private static void updateParentAddresses(final Ver2DictUpdater dictUpdater,
             final int ptNodeOriginAddress, final int newParentAddress,
             final FormatOptions formatOptions) {
         final int originalPosition = dictUpdater.getPosition();
@@ -102,7 +102,7 @@
             }
             if (!dictUpdater.readAndFollowForwardLink()) break;
             if (dictUpdater.getPosition() == FormatSpec.NO_FORWARD_LINK_ADDRESS) break;
-        } while (formatOptions.mSupportsDynamicUpdate);
+        } while (formatOptions.supportsDynamicUpdate());
         dictUpdater.setPosition(originalPosition);
     }
 
@@ -114,7 +114,7 @@
      * @param newChildrenAddress the absolute address of the child.
      * @param formatOptions file format options.
      */
-    private static void updateChildrenAddress(final Ver3DictUpdater dictUpdater,
+    private static void updateChildrenAddress(final Ver2DictUpdater dictUpdater,
             final int ptNodeOriginAddress, final int newChildrenAddress,
             final FormatOptions formatOptions) {
         final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
@@ -134,7 +134,7 @@
      * Helper method to move a PtNode to the tail of the file.
      */
     private static int movePtNode(final OutputStream destination,
-            final Ver3DictUpdater dictUpdater, final PtNodeInfo info,
+            final Ver2DictUpdater dictUpdater, final PtNodeInfo info,
             final int nodeArrayOriginAddress, final int oldNodeAddress,
             final FormatOptions formatOptions) throws IOException {
         final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
@@ -151,7 +151,7 @@
     }
 
     @SuppressWarnings("unused")
-    private static void updateForwardLink(final Ver3DictUpdater dictUpdater,
+    private static void updateForwardLink(final Ver2DictUpdater dictUpdater,
             final int nodeArrayOriginAddress, final int newNodeArrayAddress,
             final FormatOptions formatOptions) {
         final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
@@ -199,7 +199,7 @@
             final int length, final int flags, final int frequency, final int parentAddress,
             final ArrayList<WeightedString> shortcutTargets,
             final ArrayList<PendingAttribute> bigrams, final OutputStream destination,
-            final Ver3DictUpdater dictUpdater, final int oldPtNodeArrayOrigin,
+            final Ver2DictUpdater dictUpdater, final int oldPtNodeArrayOrigin,
             final int oldPtNodeOrigin, final FormatOptions formatOptions) throws IOException {
         int size = 0;
         final int newPtNodeOrigin = fileEndAddress + 1;
@@ -252,7 +252,7 @@
     // TODO: Support batch insertion.
     // TODO: Remove @UsedForTesting once UserHistoryDictionary is implemented by BinaryDictionary.
     @UsedForTesting
-    public static void insertWord(final Ver3DictUpdater dictUpdater,
+    public static void insertWord(final Ver2DictUpdater dictUpdater,
             final OutputStream destination, final String word, final int frequency,
             final ArrayList<WeightedString> bigramStrings,
             final ArrayList<WeightedString> shortcuts, final boolean isNotAWord,
diff --git a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
index 846aacf..f23fe46 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
@@ -40,12 +40,8 @@
      * p | not used                                3 bits
      * t | each unigram and bigram entry has a time stamp?
      * i |                                         1 bit, 1 = yes, 0 = no : CONTAINS_TIMESTAMP_FLAG
-     * o | has bigrams ?                           1 bit, 1 = yes, 0 = no : CONTAINS_BIGRAMS_FLAG
-     * n | FRENCH_LIGATURE_PROCESSING_FLAG
-     * f | supports dynamic updates ?              1 bit, 1 = yes, 0 = no : SUPPORTS_DYNAMIC_UPDATE
-     * l | GERMAN_UMLAUT_PROCESSING_FLAG
-     * a |
-     * gs
+     * o |
+     * nflags
      *
      * h |
      * e | size of the file header, 4bytes
@@ -82,45 +78,36 @@
      * s
      *
      * f |
-     * o | IF SUPPORTS_DYNAMIC_UPDATE (defined in the file header)
-     * r |     forward link address, 3byte
-     * w | 1 byte = bbbbbbbb match
-     * a |   case 1xxxxxxx => -((xxxxxxx << 16) + (next byte << 8) + next byte)
-     * r |   otherwise => (xxxxxxx << 16) + (next byte << 8) + next byte
-     * d |
-     * linkaddress
+     * o | forward link address, 3byte
+     * r | 1 byte = bbbbbbbb match
+     * w |   case 1xxxxxxx => -((xxxxxxx << 16) + (next byte << 8) + next byte)
+     * a |   otherwise => (xxxxxxx << 16) + (next byte << 8) + next byte
+     * r |
+     * dlinkaddress
      */
 
     /* Node (FusionDictionary.PtNode) layout is as follows:
-     *   | IF !SUPPORTS_DYNAMIC_UPDATE
-     *   |   addressType                    xx               : mask with MASK_CHILDREN_ADDRESS_TYPE
-     *   |                          2 bits, 00 = no children : FLAG_CHILDREN_ADDRESS_TYPE_NOADDRESS
-     * f |                                  01 = 1 byte      : FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE
-     * l |                                  10 = 2 bytes     : FLAG_CHILDREN_ADDRESS_TYPE_TWOBYTES
-     * a |                                  11 = 3 bytes     : FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES
-     * g | ELSE
-     * s |   is moved ?             2 bits, 11 = no          : FLAG_IS_NOT_MOVED
-     *   |                            This must be the same as FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES
-     *   |                                  01 = yes         : FLAG_IS_MOVED
-     *   |                        the new address is stored in the same place as the parent address
-     *   |   is deleted?                    10 = yes         : FLAG_IS_DELETED
-     *   | has several chars ?         1 bit, 1 = yes, 0 = no   : FLAG_HAS_MULTIPLE_CHARS
-     *   | has a terminal ?            1 bit, 1 = yes, 0 = no   : FLAG_IS_TERMINAL
-     *   | has shortcut targets ?      1 bit, 1 = yes, 0 = no   : FLAG_HAS_SHORTCUT_TARGETS
+     *   | is moved ?             2 bits, 11 = no          : FLAG_IS_NOT_MOVED
+     *   |                          This must be the same as FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES
+     *   |                                01 = yes         : FLAG_IS_MOVED
+     * f |                      the new address is stored in the same place as the parent address
+     * l | is deleted?                    10 = yes         : FLAG_IS_DELETED
+     * a | has several chars ?         1 bit, 1 = yes, 0 = no   : FLAG_HAS_MULTIPLE_CHARS
+     * g | has a terminal ?            1 bit, 1 = yes, 0 = no   : FLAG_IS_TERMINAL
+     * s | has shortcut targets ?      1 bit, 1 = yes, 0 = no   : FLAG_HAS_SHORTCUT_TARGETS
      *   | has bigrams ?               1 bit, 1 = yes, 0 = no   : FLAG_HAS_BIGRAMS
      *   | is not a word ?             1 bit, 1 = yes, 0 = no   : FLAG_IS_NOT_A_WORD
      *   | is blacklisted ?            1 bit, 1 = yes, 0 = no   : FLAG_IS_BLACKLISTED
      *
      * p |
-     * a | IF SUPPORTS_DYNAMIC_UPDATE (defined in the file header)
-     * r |     parent address, 3byte
-     * e | 1 byte = bbbbbbbb match
-     * n |   case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
-     * t |   otherwise => (bbbbbbbb << 16) + (next byte << 8) + next byte
-     * a | This address is relative to the head of the PtNode.
-     * d | If the node doesn't have a parent, this field is set to 0.
+     * a | parent address, 3byte
+     * r | 1 byte = bbbbbbbb match
+     * e |   case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
+     * n |   otherwise => (bbbbbbbb << 16) + (next byte << 8) + next byte
+     * t | This address is relative to the head of the PtNode.
+     * a | If the node doesn't have a parent, this field is set to 0.
      * d |
-     * ress
+     * dress
      *
      * c | IF FLAG_HAS_MULTIPLE_CHARS
      * h |   char, char, char, char    n * (1 or 3 bytes) : use PtNodeInfo for i/o helpers
@@ -134,23 +121,16 @@
      * e |   frequency                 1 byte
      * q |
      *
-     * c | IF SUPPORTS_DYNAMIC_UPDATE
-     * h |   children address, 3 bytes
-     * i |   1 byte = bbbbbbbb match
-     * l |     case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
-     * d |     otherwise => (bbbbbbbb<<16) + (next byte << 8) + next byte
-     * r |   if this node doesn't have children, this field is set to 0.
-     * e |     (see BinaryDictEncoderUtils#writeVariableSignedAddress)
-     * n | ELSIF 00 = FLAG_CHILDREN_ADDRESS_TYPE_NOADDRESS == addressType
-     * a |   // nothing
-     * d | ELSIF 01 = FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE == addressType
-     * d |   children address, 1 byte
-     * r | ELSIF 10 = FLAG_CHILDREN_ADDRESS_TYPE_TWOBYTES == addressType
-     * e |   children address, 2 bytes
-     * s | ELSE // 11 = FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES = addressType
-     * s |   children address, 3 bytes
-     *   | END
-     *   | This address is relative to the position of this field.
+     * c |
+     * h | children address, 3 bytes
+     * i | 1 byte = bbbbbbbb match
+     * l |   case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
+     * d |   otherwise => (bbbbbbbb<<16) + (next byte << 8) + next byte
+     * r | if this node doesn't have children, this field is set to 0.
+     * e |   (see BinaryDictEncoderUtils#writeVariableSignedAddress)
+     * n | This address is relative to the position of this field.
+     * a |
+     * ddress
      *
      *   | IF FLAG_IS_TERMINAL && FLAG_HAS_SHORTCUT_TARGETS
      *   | shortcut string list
@@ -214,11 +194,7 @@
     static final int MAXIMUM_SUPPORTED_VERSION = VERSION4;
 
     // These options need to be the same numeric values as the one in the native reading code.
-    static final int GERMAN_UMLAUT_PROCESSING_FLAG = 0x1;
     // TODO: Make the native reading code read this variable.
-    static final int SUPPORTS_DYNAMIC_UPDATE = 0x2;
-    static final int FRENCH_LIGATURE_PROCESSING_FLAG = 0x4;
-    static final int CONTAINS_BIGRAMS_FLAG = 0x8;
     static final int CONTAINS_TIMESTAMP_FLAG = 0x10;
 
     // TODO: Make this value adaptative to content data, store it in the header, and
@@ -339,30 +315,23 @@
      */
     public static final class FormatOptions {
         public final int mVersion;
-        public final boolean mSupportsDynamicUpdate;
         public final boolean mHasTerminalId;
         public final boolean mHasTimestamp;
+
         @UsedForTesting
         public FormatOptions(final int version) {
-            this(version, false);
+            this(version, false /* hasTimestamp */);
         }
 
-        @UsedForTesting
-        public FormatOptions(final int version, final boolean supportsDynamicUpdate) {
-            this(version, supportsDynamicUpdate, false /* hasTimestamp */);
-        }
-
-        public FormatOptions(final int version, final boolean supportsDynamicUpdate,
-                final boolean hasTimestamp) {
+        public FormatOptions(final int version, final boolean hasTimestamp) {
             mVersion = version;
-            if (version < FIRST_VERSION_WITH_DYNAMIC_UPDATE && supportsDynamicUpdate) {
-                throw new RuntimeException("Dynamic updates are only supported with versions "
-                        + FIRST_VERSION_WITH_DYNAMIC_UPDATE + " and ulterior.");
-            }
-            mSupportsDynamicUpdate = supportsDynamicUpdate;
             mHasTerminalId = (version >= FIRST_VERSION_WITH_TERMINAL_ID);
             mHasTimestamp = hasTimestamp;
         }
+
+        public boolean supportsDynamicUpdate() {
+            return mVersion >= FIRST_VERSION_WITH_DYNAMIC_UPDATE;
+        }
     }
 
     /**
@@ -374,7 +343,6 @@
         public final FormatOptions mFormatOptions;
         // Note that these are corresponding definitions in native code in latinime::HeaderPolicy
         // and latinime::HeaderReadWriteUtils.
-        public static final String SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE = "SUPPORTS_DYNAMIC_UPDATE";
         public static final String USES_FORGETTING_CURVE_ATTRIBUTE = "USES_FORGETTING_CURVE";
         public static final String HAS_HISTORICAL_INFO_ATTRIBUTE = "HAS_HISTORICAL_INFO";
         public static final String ATTRIBUTE_VALUE_TRUE = "1";
@@ -433,7 +401,7 @@
         if (dictFile.isDirectory()) {
             return new Ver4DictDecoder(dictFile, bufferType);
         } else if (dictFile.isFile()) {
-            return new Ver3DictDecoder(dictFile, bufferType);
+            return new Ver2DictDecoder(dictFile, bufferType);
         }
         return null;
     }
@@ -443,7 +411,7 @@
         if (dictFile.isDirectory()) {
             return new Ver4DictDecoder(dictFile, factory);
         } else if (dictFile.isFile()) {
-            return new Ver3DictDecoder(dictFile, factory);
+            return new Ver2DictDecoder(dictFile, factory);
         }
         return null;
     }
diff --git a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
index 3bb218b..fdf2ae7 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
@@ -303,14 +303,9 @@
      * Options global to the dictionary.
      */
     public static final class DictionaryOptions {
-        public final boolean mGermanUmlautProcessing;
-        public final boolean mFrenchLigatureProcessing;
         public final HashMap<String, String> mAttributes;
-        public DictionaryOptions(final HashMap<String, String> attributes,
-                final boolean germanUmlautProcessing, final boolean frenchLigatureProcessing) {
+        public DictionaryOptions(final HashMap<String, String> attributes) {
             mAttributes = attributes;
-            mGermanUmlautProcessing = germanUmlautProcessing;
-            mFrenchLigatureProcessing = frenchLigatureProcessing;
         }
         @Override
         public String toString() { // Convenience method
@@ -339,14 +334,6 @@
                 }
                 s.append("\n");
             }
-            if (mGermanUmlautProcessing) {
-                s.append(indent);
-                s.append("Needs German umlaut processing\n");
-            }
-            if (mFrenchLigatureProcessing) {
-                s.append(indent);
-                s.append("Needs French ligature processing\n");
-            }
             return s.toString();
         }
     }
@@ -701,138 +688,6 @@
     }
 
     /**
-     * Recursively count the number of nodes in a given branch of the trie.
-     *
-     * @param nodeArray the node array to count.
-     * @return the number of nodes in this branch.
-     */
-    public static int countNodeArrays(final PtNodeArray nodeArray) {
-        int size = 1;
-        for (int i = nodeArray.mData.size() - 1; i >= 0; --i) {
-            PtNode ptNode = nodeArray.mData.get(i);
-            if (null != ptNode.mChildren)
-                size += countNodeArrays(ptNode.mChildren);
-        }
-        return size;
-    }
-
-    // Recursively find out whether there are any bigrams.
-    // This can be pretty expensive especially if there aren't any (we return as soon
-    // as we find one, so it's much cheaper if there are bigrams)
-    private static boolean hasBigramsInternal(final PtNodeArray nodeArray) {
-        if (null == nodeArray) return false;
-        for (int i = nodeArray.mData.size() - 1; i >= 0; --i) {
-            PtNode ptNode = nodeArray.mData.get(i);
-            if (null != ptNode.mBigrams) return true;
-            if (hasBigramsInternal(ptNode.mChildren)) return true;
-        }
-        return false;
-    }
-
-    /**
-     * Finds out whether there are any bigrams in this dictionary.
-     *
-     * @return true if there is any bigram, false otherwise.
-     */
-    // TODO: this is expensive especially for large dictionaries without any bigram.
-    // The up side is, this is always accurate and correct and uses no memory. We should
-    // find a more efficient way of doing this, without compromising too much on memory
-    // and ease of use.
-    public boolean hasBigrams() {
-        return hasBigramsInternal(mRootNodeArray);
-    }
-
-    // Historically, the tails of the words were going to be merged to save space.
-    // However, that would prevent the code to search for a specific address in log(n)
-    // time so this was abandoned.
-    // The code is still of interest as it does add some compression to any dictionary
-    // that has no need for attributes. Implementations that does not read attributes should be
-    // able to read a dictionary with merged tails.
-    // Also, the following code does support frequencies, as in, it will only merges
-    // tails that share the same frequency. Though it would result in the above loss of
-    // performance while searching by address, it is still technically possible to merge
-    // tails that contain attributes, but this code does not take that into account - it does
-    // not compare attributes and will merge terminals with different attributes regardless.
-    public void mergeTails() {
-        MakedictLog.i("Do not merge tails");
-        return;
-
-//        MakedictLog.i("Merging PtNodes. Number of PtNodes : " + countPtNodes(root));
-//        MakedictLog.i("Number of PtNodes : " + countPtNodes(root));
-//
-//        final HashMap<String, ArrayList<PtNodeArray>> repository =
-//                  new HashMap<String, ArrayList<PtNodeArray>>();
-//        mergeTailsInner(repository, root);
-//
-//        MakedictLog.i("Number of different pseudohashes : " + repository.size());
-//        int size = 0;
-//        for (ArrayList<PtNodeArray> a : repository.values()) {
-//            size += a.size();
-//        }
-//        MakedictLog.i("Number of nodes after merge : " + (1 + size));
-//        MakedictLog.i("Recursively seen nodes : " + countNodes(root));
-    }
-
-    // The following methods are used by the deactivated mergeTails()
-//   private static boolean isEqual(PtNodeArray a, PtNodeArray b) {
-//       if (null == a && null == b) return true;
-//       if (null == a || null == b) return false;
-//       if (a.data.size() != b.data.size()) return false;
-//       final int size = a.data.size();
-//       for (int i = size - 1; i >= 0; --i) {
-//           PtNode aPtNode = a.data.get(i);
-//           PtNode bPtNode = b.data.get(i);
-//           if (aPtNode.frequency != bPtNode.frequency) return false;
-//           if (aPtNode.alternates == null && bPtNode.alternates != null) return false;
-//           if (aPtNode.alternates != null && !aPtNode.equals(bPtNode.alternates)) return false;
-//           if (!Arrays.equals(aPtNode.chars, bPtNode.chars)) return false;
-//           if (!isEqual(aPtNode.children, bPtNode.children)) return false;
-//       }
-//       return true;
-//   }
-
-//   static private HashMap<String, ArrayList<PtNodeArray>> mergeTailsInner(
-//           final HashMap<String, ArrayList<PtNodeArray>> map, final PtNodeArray nodeArray) {
-//       final ArrayList<PtNode> branches = nodeArray.data;
-//       final int nodeSize = branches.size();
-//       for (int i = 0; i < nodeSize; ++i) {
-//           PtNode ptNode = branches.get(i);
-//           if (null != ptNode.children) {
-//               String pseudoHash = getPseudoHash(ptNode.children);
-//               ArrayList<PtNodeArray> similarList = map.get(pseudoHash);
-//               if (null == similarList) {
-//                   similarList = new ArrayList<PtNodeArray>();
-//                   map.put(pseudoHash, similarList);
-//               }
-//               boolean merged = false;
-//               for (PtNodeArray similar : similarList) {
-//                   if (isEqual(ptNode.children, similar)) {
-//                       ptNode.children = similar;
-//                       merged = true;
-//                       break;
-//                   }
-//               }
-//               if (!merged) {
-//                   similarList.add(ptNode.children);
-//               }
-//               mergeTailsInner(map, ptNode.children);
-//           }
-//       }
-//       return map;
-//   }
-
-//  private static String getPseudoHash(final PtNodeArray nodeArray) {
-//      StringBuilder s = new StringBuilder();
-//      for (PtNode ptNode : nodeArray.data) {
-//          s.append(ptNode.frequency);
-//          for (int ch : ptNode.chars) {
-//              s.append(Character.toChars(ch));
-//          }
-//      }
-//      return s.toString();
-//  }
-
-    /**
      * Iterator to walk through a dictionary.
      *
      * This is purely for convenience.
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver3DictDecoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver2DictDecoder.java
similarity index 95%
rename from java/src/com/android/inputmethod/latin/makedict/Ver3DictDecoder.java
rename to java/src/com/android/inputmethod/latin/makedict/Ver2DictDecoder.java
index acab4f8..e9667ab 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver3DictDecoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver2DictDecoder.java
@@ -34,18 +34,11 @@
 import java.util.Arrays;
 
 /**
- * An implementation of DictDecoder for version 3 binary dictionary.
+ * An implementation of DictDecoder for version 2 binary dictionary.
  */
 @UsedForTesting
-public class Ver3DictDecoder extends AbstractDictDecoder {
-    private static final String TAG = Ver3DictDecoder.class.getSimpleName();
-
-    static {
-        JniUtils.loadNativeLibrary();
-    }
-
-    // TODO: implement something sensical instead of just a phony method
-    private static native int doNothing();
+public class Ver2DictDecoder extends AbstractDictDecoder {
+    private static final String TAG = Ver2DictDecoder.class.getSimpleName();
 
     protected static class PtNodeReader extends AbstractDictDecoder.PtNodeReader {
         private static int readFrequency(final DictBuffer dictBuffer) {
@@ -57,7 +50,7 @@
     private final DictionaryBufferFactory mBufferFactory;
     protected DictBuffer mDictBuffer;
 
-    /* package */ Ver3DictDecoder(final File file, final int factoryFlag) {
+    /* package */ Ver2DictDecoder(final File file, final int factoryFlag) {
         mDictionaryBinaryFile = file;
         mDictBuffer = null;
 
@@ -72,7 +65,7 @@
         }
     }
 
-    /* package */ Ver3DictDecoder(final File file, final DictionaryBufferFactory factory) {
+    /* package */ Ver2DictDecoder(final File file, final DictionaryBufferFactory factory) {
         mDictionaryBinaryFile = file;
         mBufferFactory = factory;
     }
@@ -166,7 +159,7 @@
         final ArrayList<PendingAttribute> bigrams;
         if (0 != (flags & FormatSpec.FLAG_HAS_BIGRAMS)) {
             bigrams = new ArrayList<PendingAttribute>();
-            addressPointer += PtNodeReader.readBigramAddresses(mDictBuffer, bigrams, 
+            addressPointer += PtNodeReader.readBigramAddresses(mDictBuffer, bigrams,
                     addressPointer);
             if (bigrams.size() >= FormatSpec.MAX_BIGRAMS_IN_A_PTNODE) {
                 throw new RuntimeException("Too many bigrams in a PtNode (" + bigrams.size()
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java
similarity index 97%
rename from java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
rename to java/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java
index 5da3453..6655442 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java
@@ -31,16 +31,16 @@
 import java.util.Iterator;
 
 /**
- * An implementation of DictEncoder for version 3 binary dictionary.
+ * An implementation of DictEncoder for version 2 binary dictionary.
  */
-public class Ver3DictEncoder implements DictEncoder {
+public class Ver2DictEncoder implements DictEncoder {
 
     private final File mDictFile;
     private OutputStream mOutStream;
     private byte[] mBuffer;
     private int mPosition;
 
-    public Ver3DictEncoder(final File dictFile) {
+    public Ver2DictEncoder(final File dictFile) {
         mDictFile = dictFile;
         mOutStream = null;
         mBuffer = null;
@@ -49,7 +49,7 @@
     // This constructor is used only by BinaryDictOffdeviceUtilsTests.
     // If you want to use this in the production code, you should consider keeping consistency of
     // the interface of Ver3DictDecoder by using factory.
-    public Ver3DictEncoder(final OutputStream outStream) {
+    public Ver2DictEncoder(final OutputStream outStream) {
         mDictFile = null;
         mOutStream = outStream;
     }
@@ -169,7 +169,7 @@
 
     private void writeChildrenPosition(final PtNode ptNode, final FormatOptions formatOptions) {
         final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             mPosition += BinaryDictEncoderUtils.writeSignedChildrenPosition(mBuffer, mPosition,
                     childrenPos);
         } else {
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver3DictUpdater.java b/java/src/com/android/inputmethod/latin/makedict/Ver2DictUpdater.java
similarity index 93%
rename from java/src/com/android/inputmethod/latin/makedict/Ver3DictUpdater.java
rename to java/src/com/android/inputmethod/latin/makedict/Ver2DictUpdater.java
index 07adda6..6419340 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver3DictUpdater.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver2DictUpdater.java
@@ -27,14 +27,14 @@
 import java.util.ArrayList;
 
 /**
- * An implementation of DictUpdater for version 3 binary dictionary.
+ * An implementation of DictUpdater for version 2 binary dictionary.
  */
 @UsedForTesting
-public class Ver3DictUpdater extends Ver3DictDecoder implements DictUpdater {
+public class Ver2DictUpdater extends Ver2DictDecoder implements DictUpdater {
     private OutputStream mOutStream;
 
     @UsedForTesting
-    public Ver3DictUpdater(final File dictFile, final int factoryType) {
+    public Ver2DictUpdater(final File dictFile, final int factoryType) {
         // DictUpdater must have an updatable DictBuffer.
         super(dictFile, ((factoryType & MASK_DICTBUFFER) == USE_BYTEARRAY)
                 ? USE_BYTEARRAY : USE_WRITABLE_BYTEBUFFER);
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java
index 07522b5..3be62f0 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java
@@ -183,14 +183,11 @@
      * An auxiliary class for reading bigrams.
      */
     protected static class BigramContentReader extends SparseTableContentReader {
-        private final boolean mHasTimestamp;
-
         public BigramContentReader(final String name, final File baseDir,
                 final DictionaryBufferFactory factory, final boolean hasTimestamp) {
             super(name + FormatSpec.BIGRAM_FILE_EXTENSION,
                     FormatSpec.BIGRAM_ADDRESS_TABLE_BLOCK_SIZE, baseDir,
                     getContentFilenames(name, hasTimestamp), getContentIds(hasTimestamp), factory);
-            mHasTimestamp = hasTimestamp;
         }
 
         // TODO: Consolidate this method and BigramContentWriter.getContentFilenames.
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
index 1a245b6..a746f99 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
@@ -1,5 +1,4 @@
 /*
-/*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -18,25 +17,15 @@
 package com.android.inputmethod.latin.makedict;
 
 import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.CharEncoding;
-import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
+import com.android.inputmethod.latin.BinaryDictionary;
+import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
-import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
-import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
-import com.android.inputmethod.latin.utils.CollectionUtils;
-import com.android.inputmethod.latin.utils.FileUtils;
+import com.android.inputmethod.latin.utils.LocaleUtils;
 
 import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.OutputStream;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.Iterator;
 
 /**
  * An implementation of DictEncoder for version 4 binary dictionary.
@@ -44,197 +33,19 @@
 @UsedForTesting
 public class Ver4DictEncoder implements DictEncoder {
     private final File mDictPlacedDir;
-    private byte[] mTrieBuf;
-    private int mTriePos;
-    private OutputStream mTrieOutStream;
-    private OutputStream mHeaderOutStream;
-    private OutputStream mFreqOutStream;
-    private OutputStream mUnigramTimestampOutStream;
-    private OutputStream mTerminalAddressTableOutStream;
-    private File mDictDir;
-    private String mBaseFilename;
-    private BigramContentWriter mBigramWriter;
-    private ShortcutContentWriter mShortcutWriter;
 
     @UsedForTesting
     public Ver4DictEncoder(final File dictPlacedDir) {
         mDictPlacedDir = dictPlacedDir;
     }
 
-    private static class BigramContentWriter extends SparseTableContentWriter {
-        private final boolean mWriteTimestamp;
-
-        public BigramContentWriter(final String name, final int initialCapacity,
-                final File baseDir, final boolean writeTimestamp) {
-            super(name + FormatSpec.BIGRAM_FILE_EXTENSION, initialCapacity,
-                    FormatSpec.BIGRAM_ADDRESS_TABLE_BLOCK_SIZE, baseDir,
-                    getContentFilenames(name, writeTimestamp), getContentIds(writeTimestamp));
-            mWriteTimestamp = writeTimestamp;
-        }
-
-        private static String[] getContentFilenames(final String name,
-                final boolean writeTimestamp) {
-            final String[] contentFilenames;
-            if (writeTimestamp) {
-                contentFilenames = new String[] { name + FormatSpec.BIGRAM_FILE_EXTENSION,
-                        name + FormatSpec.BIGRAM_FILE_EXTENSION };
-            } else {
-                contentFilenames = new String[] { name + FormatSpec.BIGRAM_FILE_EXTENSION };
-            }
-            return contentFilenames;
-        }
-
-        private static String[] getContentIds(final boolean writeTimestamp) {
-            final String[] contentIds;
-            if (writeTimestamp) {
-                contentIds = new String[] { FormatSpec.BIGRAM_FREQ_CONTENT_ID,
-                        FormatSpec.BIGRAM_TIMESTAMP_CONTENT_ID };
-            } else {
-                contentIds = new String[] { FormatSpec.BIGRAM_FREQ_CONTENT_ID };
-            }
-            return contentIds;
-        }
-
-        public void writeBigramsForOneWord(final int terminalId, final int bigramCount,
-                final Iterator<WeightedString> bigramIterator, final FusionDictionary dict)
-                        throws IOException {
-            write(FormatSpec.BIGRAM_FREQ_CONTENT_INDEX, terminalId,
-                    new SparseTableContentWriterInterface() {
-                        @Override
-                        public void write(final OutputStream outStream) throws IOException {
-                            writeBigramsForOneWordInternal(outStream, bigramIterator, dict);
-                        }});
-            if (mWriteTimestamp) {
-                write(FormatSpec.BIGRAM_TIMESTAMP_CONTENT_INDEX, terminalId,
-                        new SparseTableContentWriterInterface() {
-                            @Override
-                            public void write(final OutputStream outStream) throws IOException {
-                                initBigramTimestampsCountersAndLevelsForOneWordInternal(outStream,
-                                        bigramCount);
-                            }});
-            }
-        }
-
-        private void writeBigramsForOneWordInternal(final OutputStream outStream,
-                final Iterator<WeightedString> bigramIterator, final FusionDictionary dict)
-                        throws IOException {
-            while (bigramIterator.hasNext()) {
-                final WeightedString bigram = bigramIterator.next();
-                final PtNode target =
-                        FusionDictionary.findWordInTree(dict.mRootNodeArray, bigram.mWord);
-                final int unigramFrequencyForThisWord = target.mFrequency;
-                final int bigramFlags = BinaryDictEncoderUtils.makeBigramFlags(
-                        bigramIterator.hasNext(), 0, bigram.mFrequency,
-                        unigramFrequencyForThisWord, bigram.mWord);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, bigramFlags,
-                        FormatSpec.PTNODE_ATTRIBUTE_FLAGS_SIZE);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, target.mTerminalId,
-                        FormatSpec.PTNODE_ATTRIBUTE_MAX_ADDRESS_SIZE);
-            }
-        }
-
-        private void initBigramTimestampsCountersAndLevelsForOneWordInternal(
-                final OutputStream outStream, final int bigramCount) throws IOException {
-            for (int i = 0; i < bigramCount; ++i) {
-                // TODO: Figure out what initial values should be.
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, 0 /* value */,
-                        FormatSpec.BIGRAM_TIMESTAMP_SIZE);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, 0 /* value */,
-                        FormatSpec.BIGRAM_COUNTER_SIZE);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, 0 /* value */,
-                        FormatSpec.BIGRAM_LEVEL_SIZE);
-            }
-        }
-    }
-
-    private static class ShortcutContentWriter extends SparseTableContentWriter {
-        public ShortcutContentWriter(final String name, final int initialCapacity,
-                final File baseDir) {
-            super(name + FormatSpec.SHORTCUT_FILE_EXTENSION, initialCapacity,
-                    FormatSpec.SHORTCUT_ADDRESS_TABLE_BLOCK_SIZE, baseDir,
-                    new String[] { name + FormatSpec.SHORTCUT_FILE_EXTENSION },
-                    new String[] { FormatSpec.SHORTCUT_CONTENT_ID });
-        }
-
-        public void writeShortcutForOneWord(final int terminalId,
-                final Iterator<WeightedString> shortcutIterator) throws IOException {
-            write(FormatSpec.SHORTCUT_CONTENT_INDEX, terminalId,
-                    new SparseTableContentWriterInterface() {
-                        @Override
-                        public void write(final OutputStream outStream) throws IOException {
-                            writeShortcutForOneWordInternal(outStream, shortcutIterator);
-                        }
-                    });
-        }
-
-        private void writeShortcutForOneWordInternal(final OutputStream outStream,
-                final Iterator<WeightedString> shortcutIterator) throws IOException {
-            while (shortcutIterator.hasNext()) {
-                final WeightedString target = shortcutIterator.next();
-                final int shortcutFlags = BinaryDictEncoderUtils.makeShortcutFlags(
-                        shortcutIterator.hasNext(), target.mFrequency);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, shortcutFlags,
-                        FormatSpec.PTNODE_ATTRIBUTE_FLAGS_SIZE);
-                CharEncoding.writeString(outStream, target.mWord);
-            }
-        }
-    }
-
-    private void openStreams(final FormatOptions formatOptions, final DictionaryOptions dictOptions)
-            throws FileNotFoundException, IOException {
-        final FileHeader header = new FileHeader(0, dictOptions, formatOptions);
-        mBaseFilename = header.getId() + "." + header.getVersion();
-        mDictDir = new File(mDictPlacedDir, mBaseFilename);
-        final File trieFile = new File(mDictDir, mBaseFilename + FormatSpec.TRIE_FILE_EXTENSION);
-        final File headerFile = new File(mDictDir,
-                mBaseFilename + FormatSpec.HEADER_FILE_EXTENSION);
-        final File freqFile = new File(mDictDir, mBaseFilename + FormatSpec.FREQ_FILE_EXTENSION);
-        final File timestampFile = new File(mDictDir,
-                mBaseFilename + FormatSpec.UNIGRAM_TIMESTAMP_FILE_EXTENSION);
-        final File terminalAddressTableFile = new File(mDictDir,
-                mBaseFilename + FormatSpec.TERMINAL_ADDRESS_TABLE_FILE_EXTENSION);
-        if (!mDictDir.isDirectory()) {
-            if (mDictDir.exists()) {
-                FileUtils.deleteRecursively(mDictDir);
-            }
-            mDictDir.mkdirs();
-        }
-        mTrieOutStream = new FileOutputStream(trieFile);
-        mHeaderOutStream = new FileOutputStream(headerFile);
-        mFreqOutStream = new FileOutputStream(freqFile);
-        mTerminalAddressTableOutStream = new FileOutputStream(terminalAddressTableFile);
-        if (formatOptions.mHasTimestamp) {
-            mUnigramTimestampOutStream = new FileOutputStream(timestampFile);
-        }
-    }
-
-    private void close() throws IOException {
-        try {
-            if (mTrieOutStream != null) {
-                mTrieOutStream.close();
-            }
-            if (mHeaderOutStream != null) {
-                mHeaderOutStream.close();
-            }
-            if (mFreqOutStream != null) {
-                mFreqOutStream.close();
-            }
-            if (mTerminalAddressTableOutStream != null) {
-                mTerminalAddressTableOutStream.close();
-            }
-            if (mUnigramTimestampOutStream != null) {
-                mUnigramTimestampOutStream.close();
-            }
-        } finally {
-            mTrieOutStream = null;
-            mHeaderOutStream = null;
-            mFreqOutStream = null;
-            mTerminalAddressTableOutStream = null;
-        }
-    }
-
+    // TODO: This builds a FusionDictionary first and iterates it to add words to the binary
+    // dictionary. However, it is possible to just add words directly to the binary dictionary
+    // instead.
+    // In the long run, when we stop supporting version 2, FusionDictionary will become deprecated
+    // and we can remove it. Then we'll be able to just call BinaryDictionary directly.
     @Override
-    public void writeDictionary(final FusionDictionary dict, final FormatOptions formatOptions)
+    public void writeDictionary(FusionDictionary dict, FormatOptions formatOptions)
             throws IOException, UnsupportedFormatException {
         if (formatOptions.mVersion != FormatSpec.VERSION4) {
             throw new UnsupportedFormatException("File header has a wrong version number : "
@@ -243,208 +54,70 @@
         if (!mDictPlacedDir.isDirectory()) {
             throw new UnsupportedFormatException("Given path is not a directory.");
         }
-
-        if (mTrieOutStream == null) {
-            openStreams(formatOptions, dict.mOptions);
+        if (!BinaryDictionary.createEmptyDictFile(mDictPlacedDir.getAbsolutePath(),
+                FormatSpec.VERSION4, dict.mOptions.mAttributes)) {
+            throw new IOException("Cannot create dictionary file");
         }
-
-        BinaryDictEncoderUtils.writeDictionaryHeader(mHeaderOutStream, dict, formatOptions);
-
-        MakedictLog.i("Flattening the tree...");
-        ArrayList<PtNodeArray> flatNodes = BinaryDictEncoderUtils.flattenTree(dict.mRootNodeArray);
-        int terminalCount = 0;
-        final ArrayList<PtNode> nodes = CollectionUtils.newArrayList();
-        for (final PtNodeArray array : flatNodes) {
-            for (final PtNode node : array.mData) {
-                if (node.isTerminal()) {
-                    nodes.add(node);
-                    node.mTerminalId = terminalCount++;
+        final BinaryDictionary binaryDict = new BinaryDictionary(mDictPlacedDir.getAbsolutePath(),
+                0l, mDictPlacedDir.length(), true /* useFullEditDistance */,
+                LocaleUtils.constructLocaleFromString(dict.mOptions.mAttributes.get(
+                        FormatSpec.FileHeader.DICTIONARY_LOCALE_ATTRIBUTE)),
+                Dictionary.TYPE_USER /* Dictionary type. Does not matter for us */,
+                true /* isUpdatable */);
+        if (!binaryDict.isValidDictionary()) {
+            // Somehow createEmptyDictFile returned true, but the file was not created correctly
+            throw new IOException("Cannot create dictionary file");
+        }
+        for (final Word word : dict) {
+            // TODO: switch to addMultipleDictionaryEntries when they support shortcuts
+            if (null == word.mShortcutTargets || word.mShortcutTargets.isEmpty()) {
+                binaryDict.addUnigramWord(word.mWord, word.mFrequency,
+                        null /* shortcutTarget */, 0 /* shortcutProbability */,
+                        word.mIsNotAWord, word.mIsBlacklistEntry, 0 /* timestamp */);
+            } else {
+                for (final WeightedString shortcutTarget : word.mShortcutTargets) {
+                    binaryDict.addUnigramWord(word.mWord, word.mFrequency,
+                            shortcutTarget.mWord, shortcutTarget.mFrequency,
+                            word.mIsNotAWord, word.mIsBlacklistEntry, 0 /* timestamp */);
                 }
             }
-        }
-        Collections.sort(nodes, new Comparator<PtNode>() {
-            @Override
-            public int compare(final PtNode lhs, final PtNode rhs) {
-                if (lhs.mFrequency != rhs.mFrequency) {
-                    return lhs.mFrequency < rhs.mFrequency ? -1 : 1;
-                }
-                if (lhs.mTerminalId < rhs.mTerminalId) return -1;
-                if (lhs.mTerminalId > rhs.mTerminalId) return 1;
-                return 0;
+            if (binaryDict.needsToRunGC(true /* mindsBlockByGC */)) {
+                binaryDict.flushWithGC();
             }
-        });
-        int count = 0;
-        for (final PtNode node : nodes) {
-            node.mTerminalId = count++;
         }
-
-        MakedictLog.i("Computing addresses...");
-        BinaryDictEncoderUtils.computeAddresses(dict, flatNodes, formatOptions);
-        if (MakedictLog.DBG) BinaryDictEncoderUtils.checkFlatPtNodeArrayList(flatNodes);
-
-        writeTerminalData(flatNodes, terminalCount);
-        if (formatOptions.mHasTimestamp) {
-            initUnigramTimestamps(terminalCount);
+        for (final Word word0 : dict) {
+            if (null == word0.mBigrams) continue;
+            for (final WeightedString word1 : word0.mBigrams) {
+                binaryDict.addBigramWords(word0.mWord, word1.mWord, word1.mFrequency,
+                        0 /* timestamp */);
+            }
+            if (binaryDict.needsToRunGC(true /* mindsBlockByGC */)) {
+                binaryDict.flushWithGC();
+            }
         }
-        mBigramWriter = new BigramContentWriter(mBaseFilename, terminalCount, mDictDir,
-                formatOptions.mHasTimestamp);
-        writeBigrams(flatNodes, dict);
-        mShortcutWriter = new ShortcutContentWriter(mBaseFilename, terminalCount, mDictDir);
-        writeShortcuts(flatNodes);
-
-        final PtNodeArray lastNodeArray = flatNodes.get(flatNodes.size() - 1);
-        final int bufferSize = lastNodeArray.mCachedAddressAfterUpdate + lastNodeArray.mCachedSize;
-        mTrieBuf = new byte[bufferSize];
-
-        MakedictLog.i("Writing file...");
-        for (PtNodeArray nodeArray : flatNodes) {
-            BinaryDictEncoderUtils.writePlacedPtNodeArray(dict, this, nodeArray, formatOptions);
-        }
-        if (MakedictLog.DBG) {
-            BinaryDictEncoderUtils.showStatistics(flatNodes);
-            MakedictLog.i("has " + terminalCount + " terminals.");
-        }
-        mTrieOutStream.write(mTrieBuf);
-
-        MakedictLog.i("Done");
-        close();
+        binaryDict.flushWithGC();
+        binaryDict.close();
     }
 
     @Override
     public void setPosition(int position) {
-        if (mTrieBuf == null || position < 0 || position > mTrieBuf.length) return;
-        mTriePos = position;
     }
 
     @Override
     public int getPosition() {
-        return mTriePos;
+        return 0;
     }
 
     @Override
     public void writePtNodeCount(int ptNodeCount) {
-        final int countSize = BinaryDictIOUtils.getPtNodeCountSize(ptNodeCount);
-        // ptNodeCount must fit on one byte or two bytes.
-        // Please see comments in FormatSpec
-        if (countSize != 1 && countSize != 2) {
-            throw new RuntimeException("Strange size from getPtNodeCountSize : " + countSize);
-        }
-        final int encodedPtNodeCount = (countSize == 2) ?
-                (ptNodeCount | FormatSpec.LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG) : ptNodeCount;
-        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos, encodedPtNodeCount,
-                countSize);
-    }
-
-    private void writePtNodeFlags(final PtNode ptNode, final FormatOptions formatOptions) {
-        final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
-        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos,
-                BinaryDictEncoderUtils.makePtNodeFlags(ptNode, childrenPos, formatOptions),
-                FormatSpec.PTNODE_FLAGS_SIZE);
-    }
-
-    private void writeParentPosition(int parentPos, final PtNode ptNode,
-            final FormatOptions formatOptions) {
-        if (parentPos != FormatSpec.NO_PARENT_ADDRESS) {
-            parentPos -= ptNode.mCachedAddressAfterUpdate;
-        }
-        mTriePos = BinaryDictEncoderUtils.writeParentAddress(mTrieBuf, mTriePos, parentPos,
-                formatOptions);
-    }
-
-    private void writeCharacters(final int[] characters, final boolean hasSeveralChars) {
-        mTriePos = CharEncoding.writeCharArray(characters, mTrieBuf, mTriePos);
-        if (hasSeveralChars) {
-            mTrieBuf[mTriePos++] = FormatSpec.PTNODE_CHARACTERS_TERMINATOR;
-        }
-    }
-
-    private void writeTerminalId(final int terminalId) {
-        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos, terminalId,
-                FormatSpec.PTNODE_TERMINAL_ID_SIZE);
-    }
-
-    private void writeChildrenPosition(PtNode ptNode, FormatOptions formatOptions) {
-        final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
-        if (formatOptions.mSupportsDynamicUpdate) {
-            mTriePos += BinaryDictEncoderUtils.writeSignedChildrenPosition(mTrieBuf,
-                    mTriePos, childrenPos);
-        } else {
-            mTriePos += BinaryDictEncoderUtils.writeChildrenPosition(mTrieBuf,
-                    mTriePos, childrenPos);
-        }
-    }
-
-    private void writeBigrams(final ArrayList<PtNodeArray> flatNodes, final FusionDictionary dict)
-            throws IOException {
-        mBigramWriter.openStreams();
-        for (final PtNodeArray nodeArray : flatNodes) {
-            for (final PtNode ptNode : nodeArray.mData) {
-                if (ptNode.mBigrams != null) {
-                    mBigramWriter.writeBigramsForOneWord(ptNode.mTerminalId, ptNode.mBigrams.size(),
-                            ptNode.mBigrams.iterator(), dict);
-                }
-            }
-        }
-        mBigramWriter.closeStreams();
-    }
-
-    private void writeShortcuts(final ArrayList<PtNodeArray> flatNodes) throws IOException {
-        mShortcutWriter.openStreams();
-        for (final PtNodeArray nodeArray : flatNodes) {
-            for (final PtNode ptNode : nodeArray.mData) {
-                if (ptNode.mShortcutTargets != null && !ptNode.mShortcutTargets.isEmpty()) {
-                    mShortcutWriter.writeShortcutForOneWord(ptNode.mTerminalId,
-                            ptNode.mShortcutTargets.iterator());
-                }
-            }
-        }
-        mShortcutWriter.closeStreams();
     }
 
     @Override
     public void writeForwardLinkAddress(int forwardLinkAddress) {
-        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos,
-                forwardLinkAddress, FormatSpec.FORWARD_LINK_ADDRESS_SIZE);
     }
 
     @Override
-    public void writePtNode(final PtNode ptNode, final int parentPosition,
-            final FormatOptions formatOptions, final FusionDictionary dict) {
-        writePtNodeFlags(ptNode, formatOptions);
-        writeParentPosition(parentPosition, ptNode, formatOptions);
-        writeCharacters(ptNode.mChars, ptNode.hasSeveralChars());
-        if (ptNode.isTerminal()) {
-            writeTerminalId(ptNode.mTerminalId);
-        }
-        writeChildrenPosition(ptNode, formatOptions);
-    }
-
-    private void writeTerminalData(final ArrayList<PtNodeArray> flatNodes,
-          final int terminalCount) throws IOException {
-        final byte[] freqBuf = new byte[terminalCount * FormatSpec.FREQUENCY_AND_FLAGS_SIZE];
-        final byte[] terminalAddressTableBuf =
-                new byte[terminalCount * FormatSpec.TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE];
-        for (final PtNodeArray nodeArray : flatNodes) {
-            for (final PtNode ptNode : nodeArray.mData) {
-                if (ptNode.isTerminal()) {
-                    BinaryDictEncoderUtils.writeUIntToBuffer(freqBuf,
-                            ptNode.mTerminalId * FormatSpec.FREQUENCY_AND_FLAGS_SIZE,
-                            ptNode.mFrequency, FormatSpec.FREQUENCY_AND_FLAGS_SIZE);
-                    BinaryDictEncoderUtils.writeUIntToBuffer(terminalAddressTableBuf,
-                            ptNode.mTerminalId * FormatSpec.TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE,
-                            ptNode.mCachedAddressAfterUpdate,
-                            FormatSpec.TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE);
-                }
-            }
-        }
-        mFreqOutStream.write(freqBuf);
-        mTerminalAddressTableOutStream.write(terminalAddressTableBuf);
-    }
-
-    private void initUnigramTimestamps(final int terminalCount) throws IOException {
-        // Initial value of time stamps for each word is 0.
-        final byte[] unigramTimestampBuf =
-                new byte[terminalCount * FormatSpec.UNIGRAM_TIMESTAMP_SIZE];
-        mUnigramTimestampOutStream.write(unigramTimestampBuf);
+    public void writePtNode(
+            PtNode ptNode, int parentPosition, FormatOptions formatOptions, FusionDictionary dict) {
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java
index 91d9cf3..c46bc36 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java
@@ -54,8 +54,6 @@
     }
 
     private static class BigramContentUpdater extends SparseTableContentUpdater {
-        private final boolean mHasTimestamp;
-
         public BigramContentUpdater(final String name, final File baseDir,
                 final boolean hasTimestamp) {
             super(name + FormatSpec.BIGRAM_FILE_EXTENSION,
@@ -63,7 +61,6 @@
                     BigramContentReader.getContentFilenames(name, hasTimestamp),
                     BigramContentReader.getContentIds(hasTimestamp),
                     new DictionaryBufferFromWritableByteBufferFactory());
-            mHasTimestamp = hasTimestamp;
         }
 
         public void insertBigramEntries(final int terminalId, final int frequency,
diff --git a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
index 296733f..9b573b4 100644
--- a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
+++ b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
@@ -95,8 +95,6 @@
     @Override
     protected Map<String, String> getHeaderAttributeMap() {
         HashMap<String, String> attributeMap = new HashMap<String, String>();
-        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
-                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
         attributeMap.put(FormatSpec.FileHeader.USES_FORGETTING_CURVE_ATTRIBUTE,
                 FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
         attributeMap.put(FormatSpec.FileHeader.HAS_HISTORICAL_INFO_ATTRIBUTE,
diff --git a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
index a2c3ed4..db628fe 100644
--- a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
@@ -95,8 +95,7 @@
     static FusionDictionary constructFusionDictionary(final BigramDictionaryInterface dict,
             final UserHistoryDictionaryBigramList bigrams, final HashMap<String, String> options) {
         final FusionDictionary fusionDict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(options, false,
-                        false));
+                new FusionDictionary.DictionaryOptions(options));
         int profTotal = 0;
         for (final String word1 : bigrams.keySet()) {
             final HashMap<String, Byte> word1Bigrams = bigrams.getBigrams(word1);
diff --git a/java/src/com/android/inputmethod/latin/utils/UserHistoryForgettingCurveUtils.java b/java/src/com/android/inputmethod/latin/utils/UserHistoryForgettingCurveUtils.java
deleted file mode 100644
index 677035e..0000000
--- a/java/src/com/android/inputmethod/latin/utils/UserHistoryForgettingCurveUtils.java
+++ /dev/null
@@ -1,242 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.utils;
-
-import android.util.Log;
-
-import java.util.concurrent.TimeUnit;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-
-@UsedForTesting
-public final class UserHistoryForgettingCurveUtils {
-    private static final String TAG = UserHistoryForgettingCurveUtils.class.getSimpleName();
-    private static final boolean DEBUG = false;
-    private static final int DEFAULT_FC_FREQ = 127;
-    private static final int BOOSTED_FC_FREQ = 200;
-    private static int FC_FREQ_MAX = DEFAULT_FC_FREQ;
-    /* package */ static final int COUNT_MAX = 3;
-    private static final int FC_LEVEL_MAX = 3;
-    /* package */ static final int ELAPSED_TIME_MAX = 15;
-    private static final int ELAPSED_TIME_INTERVAL_HOURS = 6;
-    private static final long ELAPSED_TIME_INTERVAL_MILLIS =
-            TimeUnit.HOURS.toMillis(ELAPSED_TIME_INTERVAL_HOURS);
-    private static final int HALF_LIFE_HOURS = 48;
-    private static final int MAX_PUSH_ELAPSED = (FC_LEVEL_MAX + 1) * (ELAPSED_TIME_MAX + 1);
-
-    public static void boostMaxFreqForDebug() {
-        FC_FREQ_MAX = BOOSTED_FC_FREQ;
-    }
-
-    public static void resetMaxFreqForDebug() {
-        FC_FREQ_MAX = DEFAULT_FC_FREQ;
-    }
-
-    private UserHistoryForgettingCurveUtils() {
-        // This utility class is not publicly instantiable.
-    }
-
-    public static final class ForgettingCurveParams {
-        private byte mFc;
-        long mLastTouchedTime = 0;
-        private final boolean mIsValid;
-
-        private void updateLastTouchedTime() {
-            mLastTouchedTime = System.currentTimeMillis();
-        }
-
-        public ForgettingCurveParams(boolean isValid) {
-            this(System.currentTimeMillis(), isValid);
-        }
-
-        private ForgettingCurveParams(long now, boolean isValid) {
-            this(pushCount((byte)0, isValid), now, now, isValid);
-        }
-
-        /** This constructor is called when the user history bigram dictionary is being restored. */
-        public ForgettingCurveParams(int fc, long now, long last) {
-            // All words with level >= 1 had been saved.
-            // Invalid words with level == 0 had been saved.
-            // Valid words words with level == 0 had *not* been saved.
-            this(fc, now, last, fcToLevel((byte)fc) > 0);
-        }
-
-        private ForgettingCurveParams(int fc, long now, long last, boolean isValid) {
-            mIsValid = isValid;
-            mFc = (byte)fc;
-            mLastTouchedTime = last;
-            updateElapsedTime(now);
-        }
-
-        public boolean isValid() {
-            return mIsValid;
-        }
-
-        public byte getFc() {
-            updateElapsedTime(System.currentTimeMillis());
-            return mFc;
-        }
-
-        public int getFrequency() {
-            updateElapsedTime(System.currentTimeMillis());
-            return UserHistoryForgettingCurveUtils.fcToFreq(mFc);
-        }
-
-        public int notifyTypedAgainAndGetFrequency() {
-            updateLastTouchedTime();
-            // TODO: Check whether this word is valid or not
-            mFc = pushCount(mFc, false);
-            return UserHistoryForgettingCurveUtils.fcToFreq(mFc);
-        }
-
-        private void updateElapsedTime(long now) {
-            final int elapsedTimeCount =
-                    (int)((now - mLastTouchedTime) / ELAPSED_TIME_INTERVAL_MILLIS);
-            if (elapsedTimeCount <= 0) {
-                return;
-            }
-            if (elapsedTimeCount >= MAX_PUSH_ELAPSED) {
-                mLastTouchedTime = now;
-                mFc = 0;
-                return;
-            }
-            for (int i = 0; i < elapsedTimeCount; ++i) {
-                mLastTouchedTime += ELAPSED_TIME_INTERVAL_MILLIS;
-                mFc = pushElapsedTime(mFc);
-            }
-        }
-    }
-
-    @UsedForTesting
-    /* package */ static  int fcToElapsedTime(byte fc) {
-        return fc & 0x0F;
-    }
-
-    @UsedForTesting
-    /* package */ static int fcToCount(byte fc) {
-        return (fc >> 4) & 0x03;
-    }
-
-    @UsedForTesting
-    /* package */ static int fcToLevel(byte fc) {
-        return (fc >> 6) & 0x03;
-    }
-
-    @UsedForTesting
-    private static int calcFreq(int elapsedTime, int count, int level) {
-        if (level <= 0) {
-            // Reserved words, just return -1
-            return -1;
-        }
-        if (count == COUNT_MAX) {
-            // Temporary promote because it's frequently typed recently
-            ++level;
-        }
-        final int et = Math.min(FC_FREQ_MAX, Math.max(0, elapsedTime));
-        final int l = Math.min(FC_LEVEL_MAX, Math.max(0, level));
-        return MathUtils.SCORE_TABLE[l - 1][et];
-    }
-
-    /* pakcage */ static byte calcFc(int elapsedTime, int count, int level) {
-        final int et = Math.min(FC_FREQ_MAX, Math.max(0, elapsedTime));
-        final int c = Math.min(COUNT_MAX, Math.max(0, count));
-        final int l = Math.min(FC_LEVEL_MAX, Math.max(0, level));
-        return (byte)(et | (c << 4) | (l << 6));
-    }
-
-    public static int fcToFreq(byte fc) {
-        final int elapsedTime = fcToElapsedTime(fc);
-        final int count = fcToCount(fc);
-        final int level = fcToLevel(fc);
-        return calcFreq(elapsedTime, count, level);
-    }
-
-    @UsedForTesting
-    public static byte pushElapsedTime(byte fc) {
-        int elapsedTime = fcToElapsedTime(fc);
-        int count = fcToCount(fc);
-        int level = fcToLevel(fc);
-        if (elapsedTime >= ELAPSED_TIME_MAX) {
-            // Downgrade level
-            elapsedTime = 0;
-            count = COUNT_MAX;
-            --level;
-        } else {
-            ++elapsedTime;
-        }
-        return calcFc(elapsedTime, count, level);
-    }
-
-    @UsedForTesting
-    public static byte pushCount(byte fc, boolean isValid) {
-        final int elapsedTime = fcToElapsedTime(fc);
-        int count = fcToCount(fc);
-        int level = fcToLevel(fc);
-        if ((elapsedTime == 0 && count >= COUNT_MAX) || (isValid && level == 0)) {
-            // Upgrade level
-            ++level;
-            count = 0;
-            if (DEBUG) {
-                Log.d(TAG, "Upgrade level.");
-            }
-        } else {
-            ++count;
-        }
-        return calcFc(0, count, level);
-    }
-
-    // TODO: isValid should be false for a word whose frequency is 0,
-    // or that is not in the dictionary.
-    /**
-     * Check wheather we should save the bigram to the SQL DB or not
-     */
-    public static boolean needsToSave(byte fc, boolean isValid, boolean addLevel0Bigram) {
-        int level = fcToLevel(fc);
-        if (level == 0) {
-            if (isValid || !addLevel0Bigram) {
-                return false;
-            }
-        }
-        final int elapsedTime = fcToElapsedTime(fc);
-        return (elapsedTime < ELAPSED_TIME_MAX - 1 || level > 0);
-    }
-
-    private static final class MathUtils {
-        public static final int[][] SCORE_TABLE = new int[FC_LEVEL_MAX][ELAPSED_TIME_MAX + 1];
-        static {
-            for (int i = 0; i < FC_LEVEL_MAX; ++i) {
-                final float initialFreq;
-                if (i >= 2) {
-                    initialFreq = FC_FREQ_MAX;
-                } else if (i == 1) {
-                    initialFreq = FC_FREQ_MAX / 2;
-                } else if (i == 0) {
-                    initialFreq = FC_FREQ_MAX / 4;
-                } else {
-                    continue;
-                }
-                for (int j = 0; j < ELAPSED_TIME_MAX; ++j) {
-                    final float elapsedHours = j * ELAPSED_TIME_INTERVAL_HOURS;
-                    final float freq = initialFreq
-                            * (float)Math.pow(initialFreq, elapsedHours / HALF_LIFE_HOURS);
-                    final int intFreq = Math.min(FC_FREQ_MAX, Math.max(0, (int)freq));
-                    SCORE_TABLE[i][j] = intFreq;
-                }
-            }
-        }
-    }
-}
diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index e11e706..7827db3 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -39,87 +39,7 @@
 # To suppress compiler warnings for unused variables/functions used for debug features etc.
 LOCAL_CFLAGS += -Wno-unused-parameter -Wno-unused-function
 
-LATIN_IME_JNI_SRC_FILES := \
-    com_android_inputmethod_keyboard_ProximityInfo.cpp \
-    com_android_inputmethod_latin_BinaryDictionary.cpp \
-    com_android_inputmethod_latin_DicTraverseSession.cpp \
-    com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp \
-    jni_common.cpp
-
-LATIN_IME_CORE_SRC_FILES := \
-    suggest/core/suggest.cpp \
-    $(addprefix suggest/core/dicnode/, \
-        dic_node.cpp \
-        dic_node_utils.cpp \
-        dic_nodes_cache.cpp) \
-    $(addprefix suggest/core/dictionary/, \
-        bigram_dictionary.cpp \
-        bloom_filter.cpp \
-        dictionary.cpp \
-        digraph_utils.cpp \
-        error_type_utils.cpp \
-        multi_bigram_map.cpp \
-        unigram_property.cpp) \
-    $(addprefix suggest/core/layout/, \
-        additional_proximity_chars.cpp \
-        proximity_info.cpp \
-        proximity_info_params.cpp \
-        proximity_info_state.cpp \
-        proximity_info_state_utils.cpp) \
-    suggest/core/policy/weighting.cpp \
-    suggest/core/session/dic_traverse_session.cpp \
-    $(addprefix suggest/policyimpl/dictionary/, \
-        header/header_policy.cpp \
-        header/header_read_write_utils.cpp \
-        shortcut/shortcut_list_reading_utils.cpp \
-        structure/dictionary_structure_with_buffer_policy_factory.cpp) \
-    $(addprefix suggest/policyimpl/dictionary/bigram/, \
-        bigram_list_read_write_utils.cpp \
-        ver4_bigram_list_policy.cpp) \
-    $(addprefix suggest/policyimpl/dictionary/structure/pt_common/, \
-        dynamic_pt_gc_event_listeners.cpp \
-        dynamic_pt_reading_helper.cpp \
-        dynamic_pt_reading_utils.cpp \
-        dynamic_pt_updating_helper.cpp \
-        dynamic_pt_writing_utils.cpp) \
-    $(addprefix suggest/policyimpl/dictionary/structure/v2/, \
-        patricia_trie_policy.cpp \
-        patricia_trie_reading_utils.cpp) \
-    $(addprefix suggest/policyimpl/dictionary/structure/v4/, \
-        ver4_dict_buffers.cpp \
-        ver4_dict_constants.cpp \
-        ver4_patricia_trie_node_reader.cpp \
-        ver4_patricia_trie_node_writer.cpp \
-        ver4_patricia_trie_policy.cpp \
-        ver4_patricia_trie_reading_utils.cpp \
-        ver4_patricia_trie_writing_helper.cpp) \
-    $(addprefix suggest/policyimpl/dictionary/structure/v4/content/, \
-        bigram_dict_content.cpp \
-        probability_dict_content.cpp \
-        shortcut_dict_content.cpp \
-        sparse_table_dict_content.cpp \
-        terminal_position_lookup_table.cpp) \
-    $(addprefix suggest/policyimpl/dictionary/utils/, \
-        buffer_with_extendable_buffer.cpp \
-        byte_array_utils.cpp \
-        dict_file_writing_utils.cpp \
-        file_utils.cpp \
-        forgetting_curve_utils.cpp \
-        format_utils.cpp \
-        mmapped_buffer.cpp \
-        sparse_table.cpp) \
-    suggest/policyimpl/gesture/gesture_suggest_policy_factory.cpp \
-    $(addprefix suggest/policyimpl/typing/, \
-        scoring_params.cpp \
-        typing_scoring.cpp \
-        typing_suggest_policy.cpp \
-        typing_traversal.cpp \
-        typing_weighting.cpp) \
-    $(addprefix utils/, \
-        autocorrection_threshold_utils.cpp \
-        char_utils.cpp \
-        log_utils.cpp \
-        time_keeper.cpp)
+include $(LOCAL_PATH)/NativeFileList.mk
 
 LOCAL_SRC_FILES := \
     $(LATIN_IME_JNI_SRC_FILES) \
@@ -172,6 +92,4 @@
 include $(BUILD_SHARED_LIBRARY)
 
 #################### Clean up the tmp vars
-LATIN_IME_CORE_SRC_FILES :=
-LATIN_IME_JNI_SRC_FILES :=
-LATIN_IME_SRC_DIR :=
+include $(LOCAL_PATH)/CleanupNativeFileList.mk
diff --git a/native/jni/CleanupNativeFileList.mk b/native/jni/CleanupNativeFileList.mk
new file mode 100644
index 0000000..5420f16
--- /dev/null
+++ b/native/jni/CleanupNativeFileList.mk
@@ -0,0 +1,17 @@
+# Copyright (C) 2013 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LATIN_IME_CORE_SRC_FILES :=
+LATIN_IME_JNI_SRC_FILES :=
+LATIN_IME_SRC_DIR :=
diff --git a/native/jni/NativeFileList.mk b/native/jni/NativeFileList.mk
new file mode 100644
index 0000000..d80a111
--- /dev/null
+++ b/native/jni/NativeFileList.mk
@@ -0,0 +1,94 @@
+# Copyright (C) 2013 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LATIN_IME_JNI_SRC_FILES := \
+    com_android_inputmethod_keyboard_ProximityInfo.cpp \
+    com_android_inputmethod_latin_BinaryDictionary.cpp \
+    com_android_inputmethod_latin_DicTraverseSession.cpp \
+    jni_common.cpp
+
+LATIN_IME_CORE_SRC_FILES := \
+    suggest/core/suggest.cpp \
+    $(addprefix suggest/core/dicnode/, \
+        dic_node.cpp \
+        dic_node_utils.cpp \
+        dic_nodes_cache.cpp) \
+    $(addprefix suggest/core/dictionary/, \
+        bigram_dictionary.cpp \
+        bloom_filter.cpp \
+        dictionary.cpp \
+        digraph_utils.cpp \
+        error_type_utils.cpp \
+        multi_bigram_map.cpp \
+        unigram_property.cpp) \
+    $(addprefix suggest/core/layout/, \
+        additional_proximity_chars.cpp \
+        proximity_info.cpp \
+        proximity_info_params.cpp \
+        proximity_info_state.cpp \
+        proximity_info_state_utils.cpp) \
+    suggest/core/policy/weighting.cpp \
+    suggest/core/session/dic_traverse_session.cpp \
+    $(addprefix suggest/policyimpl/dictionary/, \
+        header/header_policy.cpp \
+        header/header_read_write_utils.cpp \
+        shortcut/shortcut_list_reading_utils.cpp \
+        structure/dictionary_structure_with_buffer_policy_factory.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/bigram/, \
+        bigram_list_read_write_utils.cpp \
+        ver4_bigram_list_policy.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/structure/pt_common/, \
+        dynamic_pt_gc_event_listeners.cpp \
+        dynamic_pt_reading_helper.cpp \
+        dynamic_pt_reading_utils.cpp \
+        dynamic_pt_updating_helper.cpp \
+        dynamic_pt_writing_utils.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/structure/v2/, \
+        patricia_trie_policy.cpp \
+        patricia_trie_reading_utils.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/structure/v4/, \
+        ver4_dict_buffers.cpp \
+        ver4_dict_constants.cpp \
+        ver4_patricia_trie_node_reader.cpp \
+        ver4_patricia_trie_node_writer.cpp \
+        ver4_patricia_trie_policy.cpp \
+        ver4_patricia_trie_reading_utils.cpp \
+        ver4_patricia_trie_writing_helper.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/structure/v4/content/, \
+        bigram_dict_content.cpp \
+        probability_dict_content.cpp \
+        shortcut_dict_content.cpp \
+        sparse_table_dict_content.cpp \
+        terminal_position_lookup_table.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/utils/, \
+        buffer_with_extendable_buffer.cpp \
+        byte_array_utils.cpp \
+        dict_file_writing_utils.cpp \
+        file_utils.cpp \
+        forgetting_curve_utils.cpp \
+        format_utils.cpp \
+        mmapped_buffer.cpp \
+        sparse_table.cpp) \
+    suggest/policyimpl/gesture/gesture_suggest_policy_factory.cpp \
+    $(addprefix suggest/policyimpl/typing/, \
+        scoring_params.cpp \
+        typing_scoring.cpp \
+        typing_suggest_policy.cpp \
+        typing_traversal.cpp \
+        typing_weighting.cpp) \
+    $(addprefix utils/, \
+        autocorrection_threshold_utils.cpp \
+        char_utils.cpp \
+        log_utils.cpp \
+        time_keeper.cpp)
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp b/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp
deleted file mode 100644
index 15088b6..0000000
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#define LOG_TAG "LatinIME: jni: Ver3DictDecoder"
-
-#include "com_android_inputmethod_latin_makedict_Ver3DictDecoder.h"
-
-#include "defines.h"
-#include "jni.h"
-#include "jni_common.h"
-
-namespace latinime {
-static int latinime_Ver3DictDecoder_doNothing(JNIEnv *env, jclass clazz) {
-    // This is a phony method for test - it does nothing. It just returns some value
-    // unlikely to be in memory by chance for testing purposes.
-    // TODO: remove this method.
-    return 2097;
-}
-
-static const JNINativeMethod sMethods[] = {
-    {
-        // TODO: remove this entry when we have one useful method in here
-        const_cast<char *>("doNothing"),
-        const_cast<char *>("()I"),
-        reinterpret_cast<void *>(latinime_Ver3DictDecoder_doNothing)
-    },
-};
-
-int register_Ver3DictDecoder(JNIEnv *env) {
-    const char *const kClassPathName =
-            "com/android/inputmethod/latin/makedict/Ver3DictDecoder";
-    return registerNativeMethods(env, kClassPathName, sMethods, NELEMS(sMethods));
-}
-} // namespace latinime
diff --git a/native/jni/jni_common.cpp b/native/jni/jni_common.cpp
index 3a8f436..f2867d7 100644
--- a/native/jni/jni_common.cpp
+++ b/native/jni/jni_common.cpp
@@ -18,12 +18,9 @@
 
 #include "jni_common.h"
 
-#ifndef HOST_TOOL
 #include "com_android_inputmethod_keyboard_ProximityInfo.h"
 #include "com_android_inputmethod_latin_BinaryDictionary.h"
 #include "com_android_inputmethod_latin_DicTraverseSession.h"
-#endif
-#include "com_android_inputmethod_latin_makedict_Ver3DictDecoder.h"
 #include "defines.h"
 
 /*
@@ -41,7 +38,6 @@
         AKLOGE("ERROR: JNIEnv is invalid");
         return -1;
     }
-#ifndef HOST_TOOL
     if (!latinime::register_BinaryDictionary(env)) {
         AKLOGE("ERROR: BinaryDictionary native registration failed");
         return -1;
@@ -54,11 +50,6 @@
         AKLOGE("ERROR: ProximityInfo native registration failed");
         return -1;
     }
-#endif
-    if (!latinime::register_Ver3DictDecoder(env)) {
-        AKLOGE("ERROR: Ver3DictDecoder native registration failed");
-        return -1;
-    }
     /* success -- return valid version number */
     return JNI_VERSION_1_6;
 }
diff --git a/native/jni/src/defines.h b/native/jni/src/defines.h
index 9a26fe0..1969eba 100644
--- a/native/jni/src/defines.h
+++ b/native/jni/src/defines.h
@@ -87,12 +87,21 @@
 }
 
 #if defined(FLAG_DO_PROFILE) || defined(FLAG_DBG)
+#if defined(__ANDROID__)
 #include <android/log.h>
+#endif // defined(__ANDROID__)
 #ifndef LOG_TAG
 #define LOG_TAG "LatinIME: "
 #endif // LOG_TAG
+
+#if defined(HOST_TOOL)
+#include <stdio.h>
+#define AKLOGE(fmt, ...) printf(fmt "\n", ##__VA_ARGS__)
+#define AKLOGI(fmt, ...) printf(fmt "\n", ##__VA_ARGS__)
+#else // defined(HOST_TOOL)
 #define AKLOGE(fmt, ...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, fmt, ##__VA_ARGS__)
 #define AKLOGI(fmt, ...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, fmt, ##__VA_ARGS__)
+#endif // defined(HOST_TOOL)
 
 #define DUMP_RESULT(words, frequencies) do { dumpResult(words, frequencies); } while (0)
 #define DUMP_WORD(word, length) do { dumpWord(word, length); } while (0)
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp
index 34fecc2..9afb5f2 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp
@@ -33,8 +33,7 @@
         ".shortcut_index_shortcut";
 
 // Version 4 dictionary size is implicitly limited to 8MB due to 3-byte offsets.
-// TODO: Make MAX_DICTIONARY_SIZE 8MB.
-const int Ver4DictConstants::MAX_DICTIONARY_SIZE = 2 * 1024 * 1024;
+const int Ver4DictConstants::MAX_DICTIONARY_SIZE = 8 * 1024 * 1024;
 // Extended region size, which is not GCed region size in dict file + additional buffer size, is
 // limited to 1MB to prevent from inefficient traversing.
 const int Ver4DictConstants::MAX_DICT_EXTENDED_REGION_SIZE = 1 * 1024 * 1024;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.cpp
index 1f25cfa..9441a75 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.cpp
@@ -53,6 +53,11 @@
 
 // Remove a directory and all files in the directory.
 /* static */ bool FileUtils::removeDirAndFiles(const char *const dirPath) {
+    return removeDirAndFiles(dirPath, 5 /* maxTries */);
+}
+
+// Remove a directory and all files in the directory, trying up to maxTimes.
+/* static */ bool FileUtils::removeDirAndFiles(const char *const dirPath, const int maxTries) {
     DIR *const dir = opendir(dirPath);
     if (dir == NULL) {
         AKLOGE("Cannot open dir %s.", dirPath);
@@ -60,7 +65,7 @@
     }
     struct dirent *dirent;
     while ((dirent = readdir(dir)) != NULL) {
-        if (dirent->d_type != DT_REG) {
+        if (dirent->d_type == DT_DIR) {
             continue;
         }
         const int filePathBufSize = getFilePathBufSize(dirPath, dirent->d_name);
@@ -74,8 +79,14 @@
     }
     closedir(dir);
     if (remove(dirPath) != 0) {
-        AKLOGE("Cannot remove directory %s.", dirPath);
-        return false;
+        if (maxTries > 0) {
+            // On NFS, deleting files sometimes creates new files. I'm not sure what the
+            // correct way of dealing with this is, but for the time being, this seems to work.
+            removeDirAndFiles(dirPath, maxTries - 1);
+        } else {
+            AKLOGE("Cannot remove directory %s.", dirPath);
+            return false;
+        }
     }
     return true;
 }
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.h b/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.h
index 3e84a303..4f1b93a 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.h
@@ -53,6 +53,8 @@
 
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(FileUtils);
+
+    static bool removeDirAndFiles(const char *const dirPath, const int maxTries);
 };
 } // namespace latinime
 #endif /* LATINIME_FILE_UTILS_H */
diff --git a/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java b/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
index e027651..098b211 100644
--- a/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
+++ b/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
@@ -115,19 +115,16 @@
                 getContext().getCacheDir());
         FileUtils.deleteRecursively(file);
         Map<String, String> attributeMap = new HashMap<String, String>();
-        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
-                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
         attributeMap.put(FormatSpec.FileHeader.USES_FORGETTING_CURVE_ATTRIBUTE,
                 FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
         attributeMap.put(FormatSpec.FileHeader.HAS_HISTORICAL_INFO_ATTRIBUTE,
                 FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
-        final String headerFileName = file.getName() + FormatSpec.HEADER_FILE_EXTENSION;
         if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
                 FormatSpec.VERSION4, attributeMap)) {
             return file;
         } else {
-            throw new IOException("Empty dictionary " + file.getAbsolutePath() + " "
-                    + headerFileName + " cannot be created.");
+            throw new IOException("Empty dictionary " + file.getAbsolutePath()
+                    + " cannot be created.");
         }
     }
 
diff --git a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
index cfc4c76..a26c258 100644
--- a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
@@ -69,8 +69,6 @@
         file.delete();
         file.mkdir();
         Map<String, String> attributeMap = new HashMap<String, String>();
-        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
-                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
         if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
                 FormatSpec.VERSION4, attributeMap)) {
             return file;
diff --git a/tests/src/com/android/inputmethod/latin/FusionDictionaryTests.java b/tests/src/com/android/inputmethod/latin/FusionDictionaryTests.java
index cadd0f8..e211d94 100644
--- a/tests/src/com/android/inputmethod/latin/FusionDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/FusionDictionaryTests.java
@@ -31,7 +31,7 @@
 public class FusionDictionaryTests extends AndroidTestCase {
     public void testFindWordInTree() {
         FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(new HashMap<String,String>(), false, false));
+                new FusionDictionary.DictionaryOptions(new HashMap<String,String>()));
 
         dict.add("abc", 10, null, false /* isNotAWord */);
         assertNull(FusionDictionary.findWordInTree(dict.mRootNodeArray, "aaa"));
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
index e3ec2ec..aff045c 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
@@ -226,8 +226,7 @@
             final FormatSpec.FormatOptions formatOptions) {
         String result = " : buffer type = "
                 + ((bufferType == BinaryDictUtils.USE_BYTE_BUFFER) ? "byte buffer" : "byte array");
-        result += " : version = " + formatOptions.mVersion;
-        return result + ", supportsDynamicUpdate = " + formatOptions.mSupportsDynamicUpdate;
+        return result + " : version = " + formatOptions.mVersion;
     }
 
     // Tests for readDictionaryBinary and writeDictionaryBinary
@@ -315,17 +314,11 @@
         final List<String> results = CollectionUtils.newArrayList();
 
         runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION2);
+                BinaryDictUtils.VERSION2_OPTIONS);
         runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION3_WITHOUT_DYNAMIC_UPDATE);
+                BinaryDictUtils.VERSION3_OPTIONS);
         runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -336,17 +329,11 @@
         final List<String> results = CollectionUtils.newArrayList();
 
         runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION2);
+                BinaryDictUtils.VERSION2_OPTIONS);
         runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION3_WITHOUT_DYNAMIC_UPDATE);
+                BinaryDictUtils.VERSION3_OPTIONS);
         runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -472,17 +459,11 @@
         final ArrayList<String> results = CollectionUtils.newArrayList();
 
         runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION2);
+                BinaryDictUtils.VERSION2_OPTIONS);
         runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION3_WITHOUT_DYNAMIC_UPDATE);
+                BinaryDictUtils.VERSION3_OPTIONS);
         runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -493,17 +474,11 @@
         final ArrayList<String> results = CollectionUtils.newArrayList();
 
         runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION2);
+                BinaryDictUtils.VERSION2_OPTIONS);
         runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION3_WITHOUT_DYNAMIC_UPDATE);
+                BinaryDictUtils.VERSION3_OPTIONS);
         runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -612,29 +587,19 @@
     public void testGetTerminalPosition() {
         final ArrayList<String> results = CollectionUtils.newArrayList();
 
-        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_ARRAY, BinaryDictUtils.VERSION2);
         runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION3_WITHOUT_DYNAMIC_UPDATE);
+                BinaryDictUtils.VERSION2_OPTIONS);
         runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
+                BinaryDictUtils.VERSION3_OPTIONS);
         runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_ARRAY,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
-        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_BUFFER, BinaryDictUtils.VERSION2);
         runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION3_WITHOUT_DYNAMIC_UPDATE);
+                BinaryDictUtils.VERSION2_OPTIONS);
         runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
+                BinaryDictUtils.VERSION3_OPTIONS);
         runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_BUFFER,
-                BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -668,7 +633,6 @@
     }
 
     public void testDeleteWord() throws IOException, UnsupportedFormatException {
-        runTestDeleteWord(BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
-        runTestDeleteWord(BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
+        runTestDeleteWord(BinaryDictUtils.VERSION3_OPTIONS);
     }
 }
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtilsTests.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtilsTests.java
index 3089194..ba1b6b3 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtilsTests.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtilsTests.java
@@ -103,7 +103,7 @@
         Log.d(TAG, "    end address = " + info.mEndAddress);
     }
 
-    private static void printNode(final Ver3DictDecoder dictDecoder,
+    private static void printNode(final Ver2DictDecoder dictDecoder,
             final FormatSpec.FormatOptions formatOptions) {
         final DictBuffer dictBuffer = dictDecoder.getDictBuffer();
         Log.d(TAG, "Node at " + dictBuffer.position());
@@ -114,14 +114,14 @@
                     formatOptions);
             printPtNode(currentInfo);
         }
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             final int forwardLinkAddress = dictBuffer.readUnsignedInt24();
             Log.d(TAG, "    forwardLinkAddress = " + forwardLinkAddress);
         }
     }
 
     @SuppressWarnings("unused")
-    private static void printBinaryFile(final Ver3DictDecoder dictDecoder)
+    private static void printBinaryFile(final Ver2DictDecoder dictDecoder)
             throws IOException, UnsupportedFormatException {
         final FileHeader fileHeader = dictDecoder.readHeader();
         final DictBuffer dictBuffer = dictDecoder.getDictBuffer();
@@ -289,8 +289,9 @@
     }
 
     public void testInsertWord() {
-        runTestInsertWord(BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
-        runTestInsertWord(BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
+        runTestInsertWord(BinaryDictUtils.VERSION3_OPTIONS);
+        runTestInsertWord(BinaryDictUtils.VERSION4_OPTIONS_WITHOUT_TIMESTAMP);
+        runTestInsertWord(BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
     }
 
     private void runTestInsertWordWithBigrams(final FormatOptions formatOptions) {
@@ -329,8 +330,9 @@
     }
 
     public void testInsertWordWithBigrams() {
-        runTestInsertWordWithBigrams(BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
-        runTestInsertWordWithBigrams(BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
+        runTestInsertWordWithBigrams(BinaryDictUtils.VERSION3_OPTIONS);
+        runTestInsertWordWithBigrams(BinaryDictUtils.VERSION4_OPTIONS_WITHOUT_TIMESTAMP);
+        runTestInsertWordWithBigrams(BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
     }
 
     private void runTestRandomWords(final FormatOptions formatOptions) {
@@ -377,7 +379,8 @@
     }
 
     public void testRandomWords() {
-        runTestRandomWords(BinaryDictUtils.VERSION3_WITH_DYNAMIC_UPDATE);
-        runTestRandomWords(BinaryDictUtils.VERSION4_WITH_DYNAMIC_UPDATE);
+        runTestRandomWords(BinaryDictUtils.VERSION3_OPTIONS);
+        runTestRandomWords(BinaryDictUtils.VERSION4_OPTIONS_WITHOUT_TIMESTAMP);
+        runTestRandomWords(BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
     }
 }
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictUtils.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictUtils.java
index ad17a71..208cb99 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictUtils.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictUtils.java
@@ -29,23 +29,17 @@
 
     public static final String TEST_DICT_FILE_EXTENSION = ".testDict";
 
-    public static final FormatSpec.FormatOptions VERSION2 =
+    public static final FormatSpec.FormatOptions VERSION2_OPTIONS =
             new FormatSpec.FormatOptions(FormatSpec.VERSION2);
-    public static final FormatSpec.FormatOptions VERSION3_WITHOUT_DYNAMIC_UPDATE =
-            new FormatSpec.FormatOptions(FormatSpec.VERSION3, false /* supportsDynamicUpdate */);
-    public static final FormatSpec.FormatOptions VERSION3_WITH_DYNAMIC_UPDATE =
-            new FormatSpec.FormatOptions(FormatSpec.VERSION3, true /* supportsDynamicUpdate */);
-    public static final FormatSpec.FormatOptions VERSION4_WITHOUT_DYNAMIC_UPDATE =
-            new FormatSpec.FormatOptions(FormatSpec.VERSION4, false /* supportsDynamicUpdate */);
-    public static final FormatSpec.FormatOptions VERSION4_WITH_DYNAMIC_UPDATE =
-            new FormatSpec.FormatOptions(FormatSpec.VERSION4, true /* supportsDynamicUpdate */);
-    public static final FormatSpec.FormatOptions VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP =
-            new FormatSpec.FormatOptions(FormatSpec.VERSION4, true /* supportsDynamicUpdate */,
-                    true /* hasTimestamp */);
+    public static final FormatSpec.FormatOptions VERSION3_OPTIONS =
+            new FormatSpec.FormatOptions(FormatSpec.VERSION3);
+    public static final FormatSpec.FormatOptions VERSION4_OPTIONS_WITHOUT_TIMESTAMP =
+            new FormatSpec.FormatOptions(FormatSpec.VERSION4, false /* hasTimestamp */);
+    public static final FormatSpec.FormatOptions VERSION4_OPTIONS_WITH_TIMESTAMP =
+            new FormatSpec.FormatOptions(FormatSpec.VERSION4, true /* hasTimestamp */);
 
     public static DictionaryOptions makeDictionaryOptions(final String id, final String version) {
-        final DictionaryOptions options = new DictionaryOptions(new HashMap<String, String>(),
-                false /* germanUmlautProcessing */, false /* frenchLigatureProcessing */);
+        final DictionaryOptions options = new DictionaryOptions(new HashMap<String, String>());
         options.mAttributes.put(FileHeader.DICTIONARY_LOCALE_ATTRIBUTE, "en_US");
         options.mAttributes.put(FileHeader.DICTIONARY_ID_ATTRIBUTE, id);
         options.mAttributes.put(FileHeader.DICTIONARY_VERSION_ATTRIBUTE, version);
@@ -71,7 +65,7 @@
             return new Ver4DictEncoder(cacheDir);
         } else if (formatOptions.mVersion == FormatSpec.VERSION3
                 || formatOptions.mVersion == FormatSpec.VERSION2) {
-            return new Ver3DictEncoder(file);
+            return new Ver2DictEncoder(file);
         } else {
             throw new RuntimeException("The format option has a wrong version : "
                     + formatOptions.mVersion);
@@ -83,7 +77,7 @@
         if (formatOptions.mVersion == FormatSpec.VERSION4) {
             return new Ver4DictUpdater(file, DictDecoder.USE_WRITABLE_BYTEBUFFER);
         } else if (formatOptions.mVersion == FormatSpec.VERSION3) {
-            return new Ver3DictUpdater(file, DictDecoder.USE_WRITABLE_BYTEBUFFER);
+            return new Ver2DictUpdater(file, DictDecoder.USE_WRITABLE_BYTEBUFFER);
         } else {
             throw new UnsupportedFormatException("The format option has a wrong version : "
                     + formatOptions.mVersion);
diff --git a/tests/src/com/android/inputmethod/latin/makedict/Ver3DictDecoderTests.java b/tests/src/com/android/inputmethod/latin/makedict/Ver2DictDecoderTests.java
similarity index 94%
rename from tests/src/com/android/inputmethod/latin/makedict/Ver3DictDecoderTests.java
rename to tests/src/com/android/inputmethod/latin/makedict/Ver2DictDecoderTests.java
index 9611599..a85753e 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/Ver3DictDecoderTests.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/Ver2DictDecoderTests.java
@@ -32,10 +32,10 @@
 import java.io.IOException;
 
 /**
- * Unit tests for Ver3DictDecoder
+ * Unit tests for Ver2DictDecoder
  */
-public class Ver3DictDecoderTests extends AndroidTestCase {
-    private static final String TAG = Ver3DictDecoderTests.class.getSimpleName();
+public class Ver2DictDecoderTests extends AndroidTestCase {
+    private static final String TAG = Ver2DictDecoderTests.class.getSimpleName();
 
     private final byte[] data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
 
@@ -68,7 +68,7 @@
         }
 
         assertNotNull(testFile);
-        final Ver3DictDecoder dictDecoder = new Ver3DictDecoder(testFile, factory);
+        final Ver2DictDecoder dictDecoder = new Ver2DictDecoder(testFile, factory);
         try {
             dictDecoder.openDictBuffer();
         } catch (Exception e) {
@@ -110,7 +110,7 @@
             Log.e(TAG, "IOException while the creating temporary file", e);
         }
 
-        final Ver3DictDecoder dictDecoder = new Ver3DictDecoder(testFile, factory);
+        final Ver2DictDecoder dictDecoder = new Ver2DictDecoder(testFile, factory);
 
         // the default return value of getBuffer() must be null.
         assertNull("the default return value of getBuffer() is not null",
diff --git a/tests/src/com/android/inputmethod/latin/utils/ForgettingCurveTests.java b/tests/src/com/android/inputmethod/latin/utils/ForgettingCurveTests.java
deleted file mode 100644
index 823bd5d..0000000
--- a/tests/src/com/android/inputmethod/latin/utils/ForgettingCurveTests.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.utils;
-
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
-
-@SmallTest
-public class ForgettingCurveTests extends AndroidTestCase {
-    public void testFcToFreq() {
-        for (int i = 0; i < Byte.MAX_VALUE; ++i) {
-            final byte fc = (byte)i;
-            final int e = UserHistoryForgettingCurveUtils.fcToElapsedTime(fc);
-            final int c = UserHistoryForgettingCurveUtils.fcToCount(fc);
-            final int l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
-            final byte fc2 = UserHistoryForgettingCurveUtils.calcFc(e, c, l);
-            assertEquals(fc, fc2);
-        }
-        byte fc = 0;
-        int l;
-        for (int i = 0; i < 4; ++i) {
-            for (int j = 0; j < (UserHistoryForgettingCurveUtils.COUNT_MAX + 1); ++j) {
-                fc = UserHistoryForgettingCurveUtils.pushCount(fc, true);
-            }
-            l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
-            assertEquals(l, Math.max(1, Math.min(i + 1, 3)));
-        }
-        fc = 0;
-        for (int i = 0; i < 4; ++i) {
-            for (int j = 0; j < (UserHistoryForgettingCurveUtils.COUNT_MAX + 1); ++j) {
-                fc = UserHistoryForgettingCurveUtils.pushCount(fc, false);
-            }
-            l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
-            assertEquals(l, Math.min(i + 1, 3));
-        }
-        for (int i = 0; i < 4; ++i) {
-            for (int j = 0; j < (UserHistoryForgettingCurveUtils.ELAPSED_TIME_MAX + 1); ++j) {
-                fc = UserHistoryForgettingCurveUtils.pushElapsedTime(fc);
-            }
-            l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
-            assertEquals(l, Math.max(0, 2 - i));
-        }
-    }
-}
diff --git a/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java b/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
index fc921b4..ae08b49 100644
--- a/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
+++ b/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
@@ -28,8 +28,8 @@
 import com.android.inputmethod.latin.makedict.FusionDictionary;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.makedict.Ver3DictDecoder;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
+import com.android.inputmethod.latin.makedict.Ver2DictDecoder;
+import com.android.inputmethod.latin.makedict.Ver2DictEncoder;
 import com.android.inputmethod.latin.personalization.UserHistoryDictionaryBigramList;
 import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.BigramDictionaryInterface;
 import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.OnAddWordListener;
@@ -146,7 +146,7 @@
 
     private void writeDictToFile(final File file,
             final UserHistoryDictionaryBigramList bigramList) {
-        final DictEncoder dictEncoder = new Ver3DictEncoder(file);
+        final DictEncoder dictEncoder = new Ver2DictEncoder(file);
         UserHistoryDictIOUtils.writeDictionary(dictEncoder, this, bigramList, FORMAT_OPTIONS,
                 HEADER_OPTIONS);
     }
diff --git a/tools/dicttool/Android.mk b/tools/dicttool/Android.mk
index 895e4a2..95afb4c 100644
--- a/tools/dicttool/Android.mk
+++ b/tools/dicttool/Android.mk
@@ -27,11 +27,28 @@
 LATINIME_ANNOTATIONS_SOURCE_DIRECTORY := $(LATINIME_BASE_SOURCE_DIRECTORY)/annotations
 LATINIME_CORE_SOURCE_DIRECTORY := $(LATINIME_BASE_SOURCE_DIRECTORY)/latin
 MAKEDICT_CORE_SOURCE_DIRECTORY := $(LATINIME_CORE_SOURCE_DIRECTORY)/makedict
+
+# Dependencies for Dicttool. Most of these files are needed by BinaryDictionary.java. Note that
+# a significant part of the dependencies are mocked in the compat/ directory, with empty or
+# nearly-empty implementations, for parts that we don't use in Dicttool.
 USED_TARGETTED_UTILS := \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/BinaryDictionary.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/DicTraverseSession.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/Dictionary.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/InputPointers.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/LastComposedWord.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/LatinImeLogger.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/SuggestedWords.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/WordComposer.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/settings/NativeSuggestOptions.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/ByteArrayDictBuffer.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/CollectionUtils.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/FileUtils.java \
-        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/JniUtils.java
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/JniUtils.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/LocaleUtils.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/ResizableIntArray.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/StringUtils.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/UnigramProperty.java
 
 DICTTOOL_ONDEVICE_TESTS_DIRECTORY := \
         $(LATINIME_LOCAL_DIR)/tests/src/com/android/inputmethod/latin/makedict/
diff --git a/tools/dicttool/NativeLib.mk b/tools/dicttool/NativeLib.mk
index a3d3c02..05e5841 100644
--- a/tools/dicttool/NativeLib.mk
+++ b/tools/dicttool/NativeLib.mk
@@ -20,12 +20,17 @@
 
 LATINIME_DIR_RELATIVE_TO_DICTTOOL := ../..
 
+ifeq ($(FLAG_DBG), true)
+    $(warning Making debug version of native library)
+    LOCAL_CFLAGS += -DFLAG_DBG -funwind-tables -fno-inline
+endif #FLAG_DBG
+
 ifneq ($(strip $(HOST_JDK_IS_64BIT_VERSION)),)
 LOCAL_CFLAGS += -m64
 LOCAL_LDFLAGS += -m64
 endif #HOST_JDK_IS_64BIT_VERSION
 
-LOCAL_CFLAGS += -DHOST_TOOL -fPIC
+LOCAL_CFLAGS += -DHOST_TOOL -fPIC -Wno-deprecated
 LOCAL_NO_DEFAULT_COMPILER_FLAGS := true
 
 LATINIME_NATIVE_JNI_DIR := $(LATINIME_DIR_RELATIVE_TO_DICTTOOL)/native/jni
@@ -33,11 +38,7 @@
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/$(LATINIME_NATIVE_SRC_DIR)
 # Used in jni_common.cpp to avoid registering useless methods.
 
-LATIN_IME_JNI_SRC_FILES := \
-    com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp \
-    jni_common.cpp
-
-LATIN_IME_CORE_SRC_FILES :=
+include $(LOCAL_PATH)/$(LATINIME_NATIVE_JNI_DIR)/NativeFileList.mk
 
 LOCAL_SRC_FILES := \
     $(addprefix $(LATINIME_NATIVE_JNI_DIR)/, $(LATIN_IME_JNI_SRC_FILES)) \
@@ -48,4 +49,5 @@
 include $(BUILD_HOST_SHARED_LIBRARY)
 
 # Clear our private variables
+include $(LOCAL_PATH)/$(LATINIME_NATIVE_JNI_DIR)/CleanupNativeFileList.mk
 LATINIME_DIR_RELATIVE_TO_DICTTOOL := ../..
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/android/content/SharedPreferences.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/android/content/SharedPreferences.java
index 07e80f1..cfeb153 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/android/content/SharedPreferences.java
@@ -14,12 +14,10 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package android.content;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class SharedPreferences {
+    public interface OnSharedPreferenceChangeListener {
+        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key);
+    }
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/android/graphics/Rect.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/android/graphics/Rect.java
index 07e80f1..c7b61d7 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/android/graphics/Rect.java
@@ -14,12 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package android.graphics;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class Rect {
+}
diff --git a/tools/dicttool/compat/android/text/TextUtils.java b/tools/dicttool/compat/android/text/TextUtils.java
new file mode 100644
index 0000000..5a94b7d
--- /dev/null
+++ b/tools/dicttool/compat/android/text/TextUtils.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.text;
+
+public class TextUtils {
+    private TextUtils() { /* cannot be instantiated */ }
+
+    /**
+     * Returns true if the string is null or 0-length.
+     * @param str the string to be examined
+     * @return true if str is null or zero length
+     */
+    public static boolean isEmpty(CharSequence str) {
+        if (str == null || str.length() == 0)
+            return true;
+        else
+            return false;
+    }
+
+    /**
+     * Returns true if a and b are equal, including if they are both null.
+     * <p><i>Note: In platform versions 1.1 and earlier, this method only worked well if
+     * both the arguments were instances of String.</i></p>
+     * @param a first CharSequence to check
+     * @param b second CharSequence to check
+     * @return true if a and b are equal
+     */
+    public static boolean equals(CharSequence a, CharSequence b) {
+        if (a == b) return true;
+        int length;
+        if (a != null && b != null && (length = a.length()) == b.length()) {
+            if (a instanceof String && b instanceof String) {
+                return a.equals(b);
+            } else {
+                for (int i = 0; i < length; i++) {
+                    if (a.charAt(i) != b.charAt(i)) return false;
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Returns list of multiple {@link CharSequence} joined into a single
+     * {@link CharSequence} separated by localized delimiter such as ", ".
+     *
+     * @hide
+     */
+    public static CharSequence join(Iterable<CharSequence> list) {
+        final CharSequence delimiter = ", ";
+        return join(delimiter, list);
+    }
+
+    /**
+     * Returns a string containing the tokens joined by delimiters.
+     * @param tokens an array objects to be joined. Strings will be formed from
+     *     the objects by calling object.toString().
+     */
+    public static String join(CharSequence delimiter, Object[] tokens) {
+        StringBuilder sb = new StringBuilder();
+        boolean firstTime = true;
+        for (Object token: tokens) {
+            if (firstTime) {
+                firstTime = false;
+            } else {
+                sb.append(delimiter);
+            }
+            sb.append(token);
+        }
+        return sb.toString();
+    }
+
+    /**
+     * Returns a string containing the tokens joined by delimiters.
+     * @param tokens an array objects to be joined. Strings will be formed from
+     *     the objects by calling object.toString().
+     */
+    public static String join(CharSequence delimiter, Iterable tokens) {
+        StringBuilder sb = new StringBuilder();
+        boolean firstTime = true;
+        for (Object token: tokens) {
+            if (firstTime) {
+                firstTime = false;
+            } else {
+                sb.append(delimiter);
+            }
+            sb.append(token);
+        }
+        return sb.toString();
+    }
+
+}
diff --git a/tools/dicttool/compat/android/util/Log.java b/tools/dicttool/compat/android/util/Log.java
index b3b6dd8..9410e74 100644
--- a/tools/dicttool/compat/android/util/Log.java
+++ b/tools/dicttool/compat/android/util/Log.java
@@ -25,13 +25,19 @@
     public static void d(final String tag, final String message) {
         System.out.println(tag + " : " + message);
     }
-    public static void d(final String tag, final String message, final Throwable e) {
-        System.out.println(tag + " : " + message + " : " + e);
+    public static void d(final String tag, final String message, final Throwable t) {
+        System.out.println(tag + " : " + message + " : " + t);
     }
     public static void e(final String tag, final String message) {
         d(tag, message);
     }
-    public static void e(final String tag, final String message, final Throwable e) {
-        d(tag, message, e);
+    public static void e(final String tag, final String message, final Throwable t) {
+        d(tag, message, t);
+    }
+    public static void w(final String tag, final String message) {
+        d(tag, message);
+    }
+    public static void w(final String tag, final String message, final Throwable t) {
+        d(tag, message, t);
     }
 }
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/android/view/inputmethod/CompletionInfo.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/android/view/inputmethod/CompletionInfo.java
index 07e80f1..fbce725 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/android/view/inputmethod/CompletionInfo.java
@@ -14,12 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package android.view.inputmethod;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class CompletionInfo {
+    public final String getText() { return ""; }
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/android/view/inputmethod/EditorInfo.java
similarity index 66%
rename from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
rename to tools/dicttool/compat/android/view/inputmethod/EditorInfo.java
index 07e80f1..9c71181 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/android/view/inputmethod/EditorInfo.java
@@ -14,12 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package android.view.inputmethod;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class EditorInfo {
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/keyboard/Key.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/com/android/inputmethod/keyboard/Key.java
index 07e80f1..1e63bb5 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/keyboard/Key.java
@@ -14,12 +14,11 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.keyboard;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class Key {
+    public final int getX() { return 0; }
+    public final int getY() { return 0; }
+    public final int getWidth() { return 0; }
+    public final int getHeight() { return 0; }
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/keyboard/Keyboard.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/com/android/inputmethod/keyboard/Keyboard.java
index 07e80f1..61b209f 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/keyboard/Keyboard.java
@@ -14,12 +14,9 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.keyboard;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class Keyboard {
+    private final Key KEY = new Key();
+    public final Key getKey(final int i) { return KEY; }
+}
diff --git a/tools/dicttool/compat/com/android/inputmethod/keyboard/ProximityInfo.java b/tools/dicttool/compat/com/android/inputmethod/keyboard/ProximityInfo.java
new file mode 100644
index 0000000..561b663
--- /dev/null
+++ b/tools/dicttool/compat/com/android/inputmethod/keyboard/ProximityInfo.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard;
+
+public class ProximityInfo {
+    public long getNativeProximityInfo() { return 0l; }
+    private static native long setProximityInfoNative(String locale,
+            int displayWidth, int displayHeight, int gridWidth, int gridHeight,
+            int mostCommonKeyWidth, int mostCommonKeyHeight, int[] proximityCharsArray,
+            int keyCount, int[] keyXCoordinates, int[] keyYCoordinates, int[] keyWidths,
+            int[] keyHeights, int[] keyCharCodes, float[] sweetSpotCenterXs,
+            float[] sweetSpotCenterYs, float[] sweetSpotRadii);
+    private static native void releaseProximityInfoNative(long nativeProximityInfo);
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/latin/LatinIME.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/com/android/inputmethod/latin/LatinIME.java
index 07e80f1..e7aa340 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/latin/LatinIME.java
@@ -14,12 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.latin;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class LatinIME {
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/latin/settings/AdditionalFeaturesSettingUtils.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/com/android/inputmethod/latin/settings/AdditionalFeaturesSettingUtils.java
index 07e80f1..6a430d5 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/latin/settings/AdditionalFeaturesSettingUtils.java
@@ -14,12 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.latin.settings;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class AdditionalFeaturesSettingUtils {
+    public static final int ADDITIONAL_FEATURES_SETTINGS_SIZE = 0;
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/latin/settings/SettingsValues.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/com/android/inputmethod/latin/settings/SettingsValues.java
index 07e80f1..0a84cde 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/latin/settings/SettingsValues.java
@@ -14,12 +14,10 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.latin.settings;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class SettingsValues {
+    public boolean isWordCodePoint(final int code) {
+        return Character.isLetter(code);
+    }
+}
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/CombinedInputOutput.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/CombinedInputOutput.java
index 4b67169..16f82da 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/CombinedInputOutput.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/CombinedInputOutput.java
@@ -50,8 +50,6 @@
     private static final String NOT_A_WORD_TAG = "not_a_word";
     private static final String WHITELIST_TAG = "whitelist";
     private static final String OPTIONS_TAG = "options";
-    private static final String GERMAN_UMLAUT_PROCESSING_OPTION = "german_umlaut_processing";
-    private static final String FRENCH_LIGATURE_PROCESSING_OPTION = "french_ligature_processing";
     private static final String COMMENT_LINE_STARTER = "#";
 
     /**
@@ -112,13 +110,9 @@
             attributes.put(keyValue[0], keyValue[1]);
         }
 
-        final boolean processUmlauts =
-                GERMAN_UMLAUT_PROCESSING_OPTION.equals(attributes.get(OPTIONS_TAG));
-        final boolean processLigatures =
-                FRENCH_LIGATURE_PROCESSING_OPTION.equals(attributes.get(OPTIONS_TAG));
         attributes.remove(OPTIONS_TAG);
-        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(), new DictionaryOptions(
-                attributes, processUmlauts, processLigatures));
+        final FusionDictionary dict =
+                new FusionDictionary(new PtNodeArray(), new DictionaryOptions(attributes));
 
         String line;
         String word = null;
@@ -216,11 +210,6 @@
             destination.write(options.get(DICTIONARY_TAG));
             options.remove(DICTIONARY_TAG);
         }
-        if (dict.mOptions.mGermanUmlautProcessing) {
-            destination.write("," + OPTIONS_TAG + "=" + GERMAN_UMLAUT_PROCESSING_OPTION);
-        } else if (dict.mOptions.mFrenchLigatureProcessing) {
-            destination.write("," + OPTIONS_TAG + "=" + FRENCH_LIGATURE_PROCESSING_OPTION);
-        }
         for (final String key : dict.mOptions.mAttributes.keySet()) {
             final String value = dict.mOptions.mAttributes.get(key);
             destination.write("," + key + "=" + value);
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/DictionaryMaker.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/DictionaryMaker.java
index b3543a0..eb419fc 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/DictionaryMaker.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/DictionaryMaker.java
@@ -23,7 +23,7 @@
 import com.android.inputmethod.latin.makedict.FusionDictionary;
 import com.android.inputmethod.latin.makedict.MakedictLog;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
+import com.android.inputmethod.latin.makedict.Ver2DictEncoder;
 import com.android.inputmethod.latin.makedict.Ver4DictEncoder;
 
 import java.io.BufferedWriter;
@@ -361,7 +361,7 @@
         if (version == FormatSpec.VERSION4) {
             dictEncoder = new Ver4DictEncoder(outputFile);
         } else {
-            dictEncoder = new Ver3DictEncoder(outputFile);
+            dictEncoder = new Ver2DictEncoder(outputFile);
         }
         dictEncoder.writeDictionary(dict, formatOptions);
     }
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Diff.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Diff.java
index 66fd084..7ac3c67 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Diff.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Diff.java
@@ -85,18 +85,6 @@
 
     private static void diffHeaders(final FusionDictionary dict0, final FusionDictionary dict1) {
         boolean hasDifferences = false;
-        if (dict0.mOptions.mFrenchLigatureProcessing != dict1.mOptions.mFrenchLigatureProcessing) {
-            System.out.println("  French ligature processing : "
-                    + dict0.mOptions.mFrenchLigatureProcessing + " <=> "
-                    + dict1.mOptions.mFrenchLigatureProcessing);
-            hasDifferences = true;
-        }
-        else if (dict0.mOptions.mGermanUmlautProcessing != dict1.mOptions.mGermanUmlautProcessing) {
-            System.out.println("  German umlaut processing : "
-                    + dict0.mOptions.mGermanUmlautProcessing + " <=> "
-                    + dict1.mOptions.mGermanUmlautProcessing);
-            hasDifferences = true;
-        }
         final HashMap<String, String> options1 =
                 new HashMap<String, String>(dict1.mOptions.mAttributes);
         for (final String optionKey : dict0.mOptions.mAttributes.keySet()) {
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/XmlDictInputOutput.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/XmlDictInputOutput.java
index 4e99bf9..d226251 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/XmlDictInputOutput.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/XmlDictInputOutput.java
@@ -57,8 +57,6 @@
     private static final String NOT_A_WORD_ATTR = "not_a_word";
 
     private static final String OPTIONS_KEY = "options";
-    private static final String GERMAN_UMLAUT_PROCESSING_OPTION = "german_umlaut_processing";
-    private static final String FRENCH_LIGATURE_PROCESSING_OPTION = "french_ligature_processing";
 
     /**
      * SAX handler for a unigram XML file.
@@ -120,12 +118,8 @@
                     attributes.put(attrName, attrs.getValue(attrIndex));
                 }
                 final String optionsString = attributes.get(OPTIONS_KEY);
-                final boolean processUmlauts =
-                        GERMAN_UMLAUT_PROCESSING_OPTION.equals(optionsString);
-                final boolean processLigatures =
-                        FRENCH_LIGATURE_PROCESSING_OPTION.equals(optionsString);
                 mDictionary = new FusionDictionary(new PtNodeArray(),
-                        new DictionaryOptions(attributes, processUmlauts, processLigatures));
+                        new DictionaryOptions(attributes));
             } else {
                 mState = UNKNOWN;
             }
@@ -361,11 +355,6 @@
         // TODO: use an XMLSerializer if this gets big
         destination.write("<wordlist format=\"2\"");
         final HashMap<String, String> options = dict.mOptions.mAttributes;
-        if (dict.mOptions.mGermanUmlautProcessing) {
-            destination.write(" " + OPTIONS_KEY + "=\"" + GERMAN_UMLAUT_PROCESSING_OPTION + "\"");
-        } else if (dict.mOptions.mFrenchLigatureProcessing) {
-            destination.write(" " + OPTIONS_KEY + "=\"" + FRENCH_LIGATURE_PROCESSING_OPTION + "\"");
-        }
         for (final String key : dict.mOptions.mAttributes.keySet()) {
             final String value = dict.mOptions.mAttributes.get(key);
             destination.write(" " + key + "=\"" + value + "\"");
diff --git a/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java b/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
index 1baeb7a..9e397f1 100644
--- a/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
+++ b/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
@@ -24,7 +24,7 @@
 import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
+import com.android.inputmethod.latin.makedict.Ver2DictEncoder;
 
 import junit.framework.TestCase;
 
@@ -44,8 +44,7 @@
     public void testGetRawDictWorks() throws IOException, UnsupportedFormatException {
         // Create a thrice-compressed dictionary file.
         final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new DictionaryOptions(new HashMap<String, String>(),
-                        false /* germanUmlautProcessing */, false /* frenchLigatureProcessing */));
+                new DictionaryOptions(new HashMap<String, String>()));
         dict.add("foo", TEST_FREQ, null, false /* isNotAWord */);
         dict.add("fta", 1, null, false /* isNotAWord */);
         dict.add("ftb", 1, null, false /* isNotAWord */);
@@ -59,7 +58,7 @@
                 Compress.getCompressedStream(
                         Compress.getCompressedStream(
                                 new BufferedOutputStream(new FileOutputStream(dst)))));
-        final DictEncoder dictEncoder = new Ver3DictEncoder(out);
+        final DictEncoder dictEncoder = new Ver2DictEncoder(out);
         dictEncoder.writeDictionary(dict, new FormatOptions(2, false));
 
         // Test for an actually compressed dictionary and its contents
diff --git a/tools/dicttool/tests/com/android/inputmethod/latin/makedict/BinaryDictEncoderFlattenTreeTests.java b/tools/dicttool/tests/com/android/inputmethod/latin/makedict/BinaryDictEncoderFlattenTreeTests.java
index 5505823..c6e4976 100644
--- a/tools/dicttool/tests/com/android/inputmethod/latin/makedict/BinaryDictEncoderFlattenTreeTests.java
+++ b/tools/dicttool/tests/com/android/inputmethod/latin/makedict/BinaryDictEncoderFlattenTreeTests.java
@@ -32,8 +32,7 @@
     // that it does not contain any duplicates.
     public void testFlattenNodes() {
         final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new DictionaryOptions(new HashMap<String, String>(),
-                        false /* germanUmlautProcessing */, false /* frenchLigatureProcessing */));
+                new DictionaryOptions(new HashMap<String, String>()));
         dict.add("foo", 1, null, false /* isNotAWord */);
         dict.add("fta", 1, null, false /* isNotAWord */);
         dict.add("ftb", 1, null, false /* isNotAWord */);
diff --git a/tools/dicttool/tests/com/android/inputmethod/latin/makedict/FusionDictionaryTest.java b/tools/dicttool/tests/com/android/inputmethod/latin/makedict/FusionDictionaryTest.java
index 659650a..76dadc2 100644
--- a/tools/dicttool/tests/com/android/inputmethod/latin/makedict/FusionDictionaryTest.java
+++ b/tools/dicttool/tests/com/android/inputmethod/latin/makedict/FusionDictionaryTest.java
@@ -96,8 +96,7 @@
     // that it does not contain any duplicates.
     public void testFusion() {
         final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new DictionaryOptions(new HashMap<String, String>(),
-                        false /* germanUmlautProcessing */, false /* frenchLigatureProcessing */));
+                new DictionaryOptions(new HashMap<String, String>()));
         final long time = System.currentTimeMillis();
         prepare(time);
         for (int i = 0; i < sWords.size(); ++i) {