diff --git a/java/src/com/android/inputmethod/latin/LatinImeLogger.java b/java/src/com/android/inputmethod/latin/LatinImeLogger.java
index e843848..a5b4c68 100644
--- a/java/src/com/android/inputmethod/latin/LatinImeLogger.java
+++ b/java/src/com/android/inputmethod/latin/LatinImeLogger.java
@@ -44,7 +44,12 @@
             String before, String after, int position, SuggestedWords suggestedWords) {
     }
 
-    public static void logOnAutoCorrection(String before, String after, int separatorCode) {
+    public static void logOnAutoCorrectionForTyping(
+            String before, String after, int separatorCode) {
+    }
+
+    public static void logOnAutoCorrectionForGeometric(String before, String after,
+            int separatorCode, int[] xCoordinates, int[] yCoordinates, int[] relativeTimes) {
     }
 
     public static void logOnAutoCorrectionCancelled() {
diff --git a/java/src/com/android/inputmethod/latin/Settings.java b/java/src/com/android/inputmethod/latin/Settings.java
index 6251c9a..180f6c5 100644
--- a/java/src/com/android/inputmethod/latin/Settings.java
+++ b/java/src/com/android/inputmethod/latin/Settings.java
@@ -44,7 +44,7 @@
 
 public class Settings extends InputMethodSettingsFragment
         implements SharedPreferences.OnSharedPreferenceChangeListener {
-    public static final boolean ENABLE_EXPERIMENTAL_SETTINGS = false;
+    public static final boolean ENABLE_INTERNAL_SETTINGS = ProductionFlag.IS_INTERNAL;
 
     // In the same order as xml/prefs.xml
     public static final String PREF_GENERAL_SETTINGS = "general_settings";
@@ -220,7 +220,7 @@
 
         final boolean showUsabilityStudyModeOption =
                 res.getBoolean(R.bool.config_enable_usability_study_mode_option)
-                        || ProductionFlag.IS_EXPERIMENTAL || ENABLE_EXPERIMENTAL_SETTINGS;
+                        || ProductionFlag.IS_EXPERIMENTAL || ENABLE_INTERNAL_SETTINGS;
         final Preference usabilityStudyPref = findPreference(PREF_USABILITY_STUDY_MODE);
         if (!showUsabilityStudyModeOption) {
             if (usabilityStudyPref != null) {
diff --git a/java/src/com/android/inputmethod/latin/Utils.java b/java/src/com/android/inputmethod/latin/Utils.java
index 1c98b92..63b6428 100644
--- a/java/src/com/android/inputmethod/latin/Utils.java
+++ b/java/src/com/android/inputmethod/latin/Utils.java
@@ -419,7 +419,7 @@
             // smileys and other multi-character keys.
             final int codePoint = TextUtils.isEmpty(separatorString) ? Constants.NOT_A_CODE
                     : separatorString.codePointAt(0);
-            LatinImeLogger.logOnAutoCorrection(typedWord, correctedWord, codePoint);
+            LatinImeLogger.logOnAutoCorrectionForTyping(typedWord, correctedWord, codePoint);
         }
 
         public static void onAutoCorrectionCancellation() {
diff --git a/java/src/com/android/inputmethod/latin/define/ProductionFlag.java b/java/src/com/android/inputmethod/latin/define/ProductionFlag.java
index de20576..52c066a 100644
--- a/java/src/com/android/inputmethod/latin/define/ProductionFlag.java
+++ b/java/src/com/android/inputmethod/latin/define/ProductionFlag.java
@@ -22,4 +22,5 @@
     }
 
     public static final boolean IS_EXPERIMENTAL = false;
+    public static final boolean IS_INTERNAL = false;
 }
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
index 68d8bc5..72d1229 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
@@ -370,6 +370,9 @@
             g.mCachedSize = groupSize;
             size += groupSize;
         }
+        if (options.mHasLinkedListNode) {
+            size += FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
+        }
         node.mCachedSize = size;
     }
 
@@ -521,6 +524,9 @@
             group.mCachedSize = groupSize;
             size += groupSize;
         }
+        if (formatOptions.mHasLinkedListNode) {
+            size += FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
+        }
         if (node.mCachedSize != size) {
             node.mCachedSize = size;
             changed = true;
@@ -532,9 +538,11 @@
      * Computes the byte size of a list of nodes and updates each node cached position.
      *
      * @param flatNodes the array of nodes.
+     * @param formatOptions file format options.
      * @return the byte size of the entire stack.
      */
-    private static int stackNodes(final ArrayList<Node> flatNodes) {
+    private static int stackNodes(final ArrayList<Node> flatNodes,
+            final FormatOptions formatOptions) {
         int nodeOffset = 0;
         for (Node n : flatNodes) {
             n.mCachedAddress = nodeOffset;
@@ -544,7 +552,9 @@
                 g.mCachedAddress = groupCountSize + nodeOffset + groupOffset;
                 groupOffset += g.mCachedSize;
             }
-            if (groupOffset + groupCountSize != n.mCachedSize) {
+            final int nodeSize = groupCountSize + groupOffset
+                    + (formatOptions.mHasLinkedListNode ? FormatSpec.FORWARD_LINK_ADDRESS_SIZE : 0);
+            if (nodeSize != n.mCachedSize) {
                 throw new RuntimeException("Bug : Stored and computed node size differ");
             }
             nodeOffset += n.mCachedSize;
@@ -571,7 +581,7 @@
             final ArrayList<Node> flatNodes, final FormatOptions formatOptions) {
         // First get the worst sizes and offsets
         for (Node n : flatNodes) setNodeMaximumSize(n, formatOptions);
-        final int offset = stackNodes(flatNodes);
+        final int offset = stackNodes(flatNodes, formatOptions);
 
         MakedictLog.i("Compressing the array addresses. Original size : " + offset);
         MakedictLog.i("(Recursively seen size : " + offset + ")");
@@ -587,7 +597,7 @@
                 if (oldNodeSize < newNodeSize) throw new RuntimeException("Increased size ?!");
                 changesDone |= changed;
             }
-            stackNodes(flatNodes);
+            stackNodes(flatNodes, formatOptions);
             ++passes;
             if (passes > MAX_PASSES) throw new RuntimeException("Too many passes - probably a bug");
         } while (changesDone);
@@ -776,7 +786,8 @@
         return (options.mFrenchLigatureProcessing ? FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG : 0)
                 + (options.mGermanUmlautProcessing ? FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG : 0)
                 + (hasBigrams ? FormatSpec.CONTAINS_BIGRAMS_FLAG : 0)
-                + (formatOptions.mHasParentAddress ? FormatSpec.HAS_PARENT_ADDRESS : 0);
+                + (formatOptions.mHasParentAddress ? FormatSpec.HAS_PARENT_ADDRESS : 0)
+                + (formatOptions.mHasLinkedListNode ? FormatSpec.HAS_LINKEDLIST_NODE : 0);
     }
 
     /**
@@ -910,6 +921,11 @@
             }
 
         }
+        if (formatOptions.mHasLinkedListNode) {
+            buffer[index] = buffer[index + 1] = buffer[index + 2]
+                    = FormatSpec.NO_FORWARD_LINK_ADDRESS;
+            index += FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
+        }
         if (index != node.mCachedAddress + node.mCachedSize) throw new RuntimeException(
                 "Not the same size : written "
                 + (index - node.mCachedAddress) + " bytes out of a node that should have "
@@ -1525,7 +1541,8 @@
                         0 != (optionsFlags & FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG),
                         0 != (optionsFlags & FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG)),
                 new FormatOptions(version,
-                        0 != (optionsFlags & FormatSpec.HAS_PARENT_ADDRESS)));
+                        0 != (optionsFlags & FormatSpec.HAS_PARENT_ADDRESS),
+                        0 != (optionsFlags & FormatSpec.HAS_LINKEDLIST_NODE)));
         return header;
     }
 
diff --git a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
index 1707ccc..f8f13b1 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
@@ -41,6 +41,12 @@
      * u |
      * ps
      *
+     * f |
+     * o | IF HAS_LINKEDLIST_NODE (defined in the file header)
+     * r |     forward link address, 3byte
+     * w | the address must be positive.
+     * a |
+     * rdlinkaddress
      */
 
     /* Node(CharGroup) layout is as follows:
@@ -140,18 +146,23 @@
     static final int NOT_A_VERSION_NUMBER = -1;
     static final int FIRST_VERSION_WITH_HEADER_SIZE = 2;
     static final int FIRST_VERSION_WITH_PARENT_ADDRESS = 3;
+    static final int FIRST_VERSION_WITH_LINKEDLIST_NODE = 3;
 
     // 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 HAS_PARENT_ADDRESS = 0x2;
     static final int FRENCH_LIGATURE_PROCESSING_FLAG = 0x4;
     static final int CONTAINS_BIGRAMS_FLAG = 0x8;
+    // TODO: Make the native reading code read this variable.
+    static final int HAS_LINKEDLIST_NODE = 0x10;
 
     // TODO: Make this value adaptative to content data, store it in the header, and
     // use it in the reading code.
     static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
 
     static final int PARENT_ADDRESS_SIZE = 3;
+    static final int FORWARD_LINK_ADDRESS_SIZE = 3;
 
     static final int MASK_GROUP_ADDRESS_TYPE = 0xC0;
     static final int FLAG_GROUP_ADDRESS_TYPE_NOADDRESS = 0x00;
@@ -187,6 +198,7 @@
 
     static final int NO_CHILDREN_ADDRESS = Integer.MIN_VALUE;
     static final int NO_PARENT_ADDRESS = 0;
+    static final int NO_FORWARD_LINK_ADDRESS = 0;
     static final int INVALID_CHARACTER = -1;
 
     static final int MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT = 0x7F; // 127
@@ -201,16 +213,30 @@
     public static class FormatOptions {
         public final int mVersion;
         public final boolean mHasParentAddress;
+        public final boolean mHasLinkedListNode;
         public FormatOptions(final int version) {
             this(version, false);
         }
         public FormatOptions(final int version, final boolean hasParentAddress) {
+            this(version, hasParentAddress, false);
+        }
+        public FormatOptions(final int version, final boolean hasParentAddress,
+                final boolean hasLinkedListNode) {
             mVersion = version;
-            if (version < FormatSpec.FIRST_VERSION_WITH_PARENT_ADDRESS && hasParentAddress) {
+            if (version < FIRST_VERSION_WITH_PARENT_ADDRESS && hasParentAddress) {
                 throw new RuntimeException("Parent addresses are only supported with versions "
-                        + FormatSpec.FIRST_VERSION_WITH_PARENT_ADDRESS + " and ulterior.");
+                        + FIRST_VERSION_WITH_PARENT_ADDRESS + " and ulterior.");
             }
             mHasParentAddress = hasParentAddress;
+
+            if (version < FIRST_VERSION_WITH_LINKEDLIST_NODE && hasLinkedListNode) {
+                throw new RuntimeException("Linked list nodes are only supported with versions "
+                        + FIRST_VERSION_WITH_LINKEDLIST_NODE + " and ulterior.");
+            }
+            if (!hasParentAddress && hasLinkedListNode) {
+                throw new RuntimeException("Linked list nodes need parent addresses.");
+            }
+            mHasLinkedListNode = hasLinkedListNode;
         }
     }
 
diff --git a/native/jni/src/proximity_info_state.cpp b/native/jni/src/proximity_info_state.cpp
index 9b18918..ac1a39d 100644
--- a/native/jni/src/proximity_info_state.cpp
+++ b/native/jni/src/proximity_info_state.cpp
@@ -409,11 +409,11 @@
                 }
                 NearKeysDistanceMap::const_iterator itPP =
                         prevNearKeysDistances->find(minChar);
-                if (DEBUG_GEO_FULL) {
-                    AKLOGI("p1: char = %c, minDist = %f, prevNear key minDist = %f",
-                            minChar, itPP->second, minDist);
-                }
                 if (itPP != prevNearKeysDistances->end() && minDist > itPP->second) {
+                    if (DEBUG_GEO_FULL) {
+                        AKLOGI("p1: char = %c, minDist = %f, prevNear key minDist = %f",
+                                minChar, itPP->second, minDist);
+                    }
                     return popped;
                 }
             }
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOTests.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOTests.java
index 328784b..a87146e 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOTests.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOTests.java
@@ -65,9 +65,12 @@
 
     private static final FormatSpec.FormatOptions VERSION2 = new FormatSpec.FormatOptions(2);
     private static final FormatSpec.FormatOptions VERSION3_WITHOUT_PARENTADDRESS =
-            new FormatSpec.FormatOptions(3, false);
+            new FormatSpec.FormatOptions(3, false /* hasParentAddress */);
     private static final FormatSpec.FormatOptions VERSION3_WITH_PARENTADDRESS =
-            new FormatSpec.FormatOptions(3, true);
+            new FormatSpec.FormatOptions(3, true /* hasParentAddress */);
+    private static final FormatSpec.FormatOptions VERSION3_WITH_LINKEDLIST_NODE =
+            new FormatSpec.FormatOptions(3, true /* hasParentAddress */,
+                    true /* hasLinkedListNode */);
 
     private static final String[] CHARACTERS = {
         "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
@@ -236,7 +239,8 @@
         String result = " : buffer type = "
                 + ((bufferType == USE_BYTE_BUFFER) ? "byte buffer" : "byte array");
         result += " : version = " + formatOptions.mVersion;
-        return result + ", hasParentAddress = " + formatOptions.mHasParentAddress;
+        return result + ", hasParentAddress = " + formatOptions.mHasParentAddress
+                + ", hasLinkedListNode = " + formatOptions.mHasLinkedListNode;
     }
 
     // Tests for readDictionaryBinary and writeDictionaryBinary
@@ -305,6 +309,7 @@
         runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION2);
         runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION3_WITHOUT_PARENTADDRESS);
         runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION3_WITH_PARENTADDRESS);
+        runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION3_WITH_LINKEDLIST_NODE);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -317,6 +322,7 @@
         runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION2);
         runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION3_WITHOUT_PARENTADDRESS);
         runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION3_WITH_PARENTADDRESS);
+        runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION3_WITH_LINKEDLIST_NODE);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -450,6 +456,7 @@
         runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER, VERSION2);
         runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER, VERSION3_WITHOUT_PARENTADDRESS);
         runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER, VERSION3_WITH_PARENTADDRESS);
+        runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER, VERSION3_WITH_LINKEDLIST_NODE);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -462,6 +469,7 @@
         runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY, VERSION2);
         runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY, VERSION3_WITHOUT_PARENTADDRESS);
         runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY, VERSION3_WITH_PARENTADDRESS);
+        runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY, VERSION3_WITH_LINKEDLIST_NODE);
 
         for (final String result : results) {
             Log.d(TAG, result);