diff --git a/java/res/xml-sw600dp/key_styles_common.xml b/java/res/xml-sw600dp/key_styles_common.xml
index f407ba3..fc9342b 100644
--- a/java/res/xml-sw600dp/key_styles_common.xml
+++ b/java/res/xml-sw600dp/key_styles_common.xml
@@ -178,16 +178,6 @@
         latin:keyLabel="!text/label_to_alpha_key"
         latin:parentStyle="baseForLayoutSwitchKeyStyle" />
     <key-style
-        latin:styleName="toMoreSymbolKeyStyle"
-        latin:code="!code/key_shift"
-        latin:keyLabel="!text/label_to_more_symbol_for_tablet_key"
-        latin:parentStyle="baseForLayoutSwitchKeyStyle" />
-    <key-style
-        latin:styleName="backFromMoreSymbolKeyStyle"
-        latin:code="!code/key_shift"
-        latin:keyLabel="!text/label_to_symbol_key"
-        latin:parentStyle="baseForLayoutSwitchKeyStyle" />
-    <key-style
         latin:styleName="comKeyStyle"
         latin:keyLabel="!text/keylabel_for_popular_domain"
         latin:keyLabelFlags="autoXScale|fontNormal|hasPopupHint|preserveCase"
diff --git a/java/res/xml-sw768dp/key_styles_common.xml b/java/res/xml-sw768dp/key_styles_common.xml
index 7c0a82a..5389309 100644
--- a/java/res/xml-sw768dp/key_styles_common.xml
+++ b/java/res/xml-sw768dp/key_styles_common.xml
@@ -168,16 +168,6 @@
         latin:keyLabel="!text/label_to_alpha_key"
         latin:parentStyle="baseForLayoutSwitchKeyStyle" />
     <key-style
-        latin:styleName="toMoreSymbolKeyStyle"
-        latin:code="!code/key_shift"
-        latin:keyLabel="!text/label_to_more_symbol_for_tablet_key"
-        latin:parentStyle="baseForLayoutSwitchKeyStyle" />
-    <key-style
-        latin:styleName="backFromMoreSymbolKeyStyle"
-        latin:code="!code/key_shift"
-        latin:keyLabel="!text/label_to_symbol_key"
-        latin:parentStyle="baseForLayoutSwitchKeyStyle" />
-    <key-style
         latin:styleName="comKeyStyle"
         latin:keyLabel="!text/keylabel_for_popular_domain"
         latin:keyLabelFlags="fontNormal|hasPopupHint|preserveCase"
diff --git a/java/res/xml/key_styles_common.xml b/java/res/xml/key_styles_common.xml
index 355455e..dabe1e7 100644
--- a/java/res/xml/key_styles_common.xml
+++ b/java/res/xml/key_styles_common.xml
@@ -179,15 +179,6 @@
         latin:keyLabel="!text/label_to_alpha_key"
         latin:parentStyle="baseForLayoutSwitchKeyStyle" />
     <key-style
-        latin:styleName="toMoreSymbolKeyStyle"
-        latin:code="!code/key_shift"
-        latin:keyLabel="!text/label_to_more_symbol_key"
-        latin:parentStyle="baseForLayoutSwitchKeyStyle" />
-    <key-style
-        latin:styleName="backFromMoreSymbolKeyStyle"
-        latin:code="!code/key_shift"
-        latin:parentStyle="baseForToSymbolKeyStyle" />
-    <key-style
         latin:styleName="punctuationKeyStyle"
         latin:keyLabel="."
         latin:keyLabelFlags="hasPopupHint"
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
index fce2458..507080d 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
@@ -226,32 +226,30 @@
         /* 121 */ "shortcut_as_more_key",
         /* 122 */ "action_next_as_more_key",
         /* 123 */ "action_previous_as_more_key",
-        /* 124 */ "label_to_more_symbol_key",
-        /* 125 */ "label_to_more_symbol_for_tablet_key",
-        /* 126 */ "label_tab_key",
-        /* 127 */ "label_to_phone_numeric_key",
-        /* 128 */ "label_to_phone_symbols_key",
-        /* 129 */ "label_time_am",
-        /* 130 */ "label_time_pm",
-        /* 131 */ "label_to_symbol_key_pcqwerty",
-        /* 132 */ "keylabel_for_popular_domain",
-        /* 133 */ "more_keys_for_popular_domain",
-        /* 134 */ "more_keys_for_smiley",
-        /* 135 */ "single_laqm_raqm",
-        /* 136 */ "single_laqm_raqm_rtl",
-        /* 137 */ "single_raqm_laqm",
-        /* 138 */ "double_laqm_raqm",
-        /* 139 */ "double_laqm_raqm_rtl",
-        /* 140 */ "double_raqm_laqm",
-        /* 141 */ "single_lqm_rqm",
-        /* 142 */ "single_9qm_lqm",
-        /* 143 */ "single_9qm_rqm",
-        /* 144 */ "double_lqm_rqm",
-        /* 145 */ "double_9qm_lqm",
-        /* 146 */ "double_9qm_rqm",
-        /* 147 */ "more_keys_for_single_quote",
-        /* 148 */ "more_keys_for_double_quote",
-        /* 149 */ "more_keys_for_tablet_double_quote",
+        /* 124 */ "label_tab_key",
+        /* 125 */ "label_to_phone_numeric_key",
+        /* 126 */ "label_to_phone_symbols_key",
+        /* 127 */ "label_time_am",
+        /* 128 */ "label_time_pm",
+        /* 129 */ "label_to_symbol_key_pcqwerty",
+        /* 130 */ "keylabel_for_popular_domain",
+        /* 131 */ "more_keys_for_popular_domain",
+        /* 132 */ "more_keys_for_smiley",
+        /* 133 */ "single_laqm_raqm",
+        /* 134 */ "single_laqm_raqm_rtl",
+        /* 135 */ "single_raqm_laqm",
+        /* 136 */ "double_laqm_raqm",
+        /* 137 */ "double_laqm_raqm_rtl",
+        /* 138 */ "double_raqm_laqm",
+        /* 139 */ "single_lqm_rqm",
+        /* 140 */ "single_9qm_lqm",
+        /* 141 */ "single_9qm_rqm",
+        /* 142 */ "double_lqm_rqm",
+        /* 143 */ "double_9qm_lqm",
+        /* 144 */ "double_9qm_rqm",
+        /* 145 */ "more_keys_for_single_quote",
+        /* 146 */ "more_keys_for_double_quote",
+        /* 147 */ "more_keys_for_tablet_double_quote",
     };
 
     private static final String EMPTY = "";
@@ -379,28 +377,24 @@
         /* 121 */ "!icon/shortcut_key|!code/key_shortcut",
         /* 122 */ "!hasLabels!,!text/label_next_key|!code/key_action_next",
         /* 123 */ "!hasLabels!,!text/label_previous_key|!code/key_action_previous",
-        // Label for "switch to more symbol" modifier key.  Must be short to fit on key!
-        /* 124 */ "= \\ <",
-        // Label for "switch to more symbol" modifier key on tablets.  Must be short to fit on key!
-        /* 125 */ "~ \\ {",
         // Label for "Tab" key.  Must be short to fit on key!
-        /* 126 */ "Tab",
+        /* 124 */ "Tab",
         // Label for "switch to phone numeric" key.  Must be short to fit on key!
-        /* 127 */ "123",
+        /* 125 */ "123",
         // Label for "switch to phone symbols" key.  Must be short to fit on key!
         // U+FF0A: "＊" FULLWIDTH ASTERISK
         // U+FF03: "＃" FULLWIDTH NUMBER SIGN
-        /* 128 */ "\uFF0A\uFF03",
+        /* 126 */ "\uFF0A\uFF03",
         // Key label for "ante meridiem"
-        /* 129 */ "AM",
+        /* 127 */ "AM",
         // Key label for "post meridiem"
-        /* 130 */ "PM",
+        /* 128 */ "PM",
         // Label for "switch to symbols" key on PC QWERTY layout
-        /* 131 */ "Sym",
-        /* 132 */ ".com",
+        /* 129 */ "Sym",
+        /* 130 */ ".com",
         // popular web domains for the locale - most popular, displayed on the keyboard
-        /* 133 */ "!hasLabels!,.net,.org,.gov,.edu",
-        /* 134 */ "!fixedColumnOrder!5,!hasLabels!,=-O|=-O ,:-P|:-P ,;-)|;-) ,:-(|:-( ,:-)|:-) ,:-!|:-! ,:-$|:-$ ,B-)|B-) ,:O|:O ,:-*|:-* ,:-D|:-D ,:\'(|:\'( ,:-\\\\|:-\\\\ ,O:-)|O:-) ,:-[|:-[ ",
+        /* 131 */ "!hasLabels!,.net,.org,.gov,.edu",
+        /* 132 */ "!fixedColumnOrder!5,!hasLabels!,=-O|=-O ,:-P|:-P ,;-)|;-) ,:-(|:-( ,:-)|:-) ,:-!|:-! ,:-$|:-$ ,B-)|B-) ,:O|:O ,:-*|:-* ,:-D|:-D ,:\'(|:\'( ,:-\\\\|:-\\\\ ,O:-)|O:-) ,:-[|:-[ ",
         // U+2039: "‹" SINGLE LEFT-POINTING ANGLE QUOTATION MARK
         // U+203A: "›" SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
         // U+00AB: "«" LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
@@ -422,24 +416,24 @@
         // The following each quotation mark pair consist of
         // <opening quotation mark>, <closing quotation mark>
         // and is named after (single|double)_<opening quotation mark>_<closing quotation mark>.
-        /* 135 */ "\u2039,\u203A",
-        /* 136 */ "\u2039|\u203A,\u203A|\u2039",
-        /* 137 */ "\u203A,\u2039",
-        /* 138 */ "\u00AB,\u00BB",
-        /* 139 */ "\u00AB|\u00BB,\u00BB|\u00AB",
-        /* 140 */ "\u00BB,\u00AB",
+        /* 133 */ "\u2039,\u203A",
+        /* 134 */ "\u2039|\u203A,\u203A|\u2039",
+        /* 135 */ "\u203A,\u2039",
+        /* 136 */ "\u00AB,\u00BB",
+        /* 137 */ "\u00AB|\u00BB,\u00BB|\u00AB",
+        /* 138 */ "\u00BB,\u00AB",
         // The following each quotation mark triplet consists of
         // <another quotation mark>, <opening quotation mark>, <closing quotation mark>
         // and is named after (single|double)_<opening quotation mark>_<closing quotation mark>.
-        /* 141 */ "\u201A,\u2018,\u2019",
-        /* 142 */ "\u2019,\u201A,\u2018",
-        /* 143 */ "\u2018,\u201A,\u2019",
-        /* 144 */ "\u201E,\u201C,\u201D",
-        /* 145 */ "\u201D,\u201E,\u201C",
-        /* 146 */ "\u201C,\u201E,\u201D",
-        /* 147 */ "!fixedColumnOrder!5,!text/single_quotes,!text/single_angle_quotes",
-        /* 148 */ "!fixedColumnOrder!5,!text/double_quotes,!text/double_angle_quotes",
-        /* 149 */ "!fixedColumnOrder!6,!text/double_quotes,!text/single_quotes,!text/double_angle_quotes,!text/single_angle_quotes",
+        /* 139 */ "\u201A,\u2018,\u2019",
+        /* 140 */ "\u2019,\u201A,\u2018",
+        /* 141 */ "\u2018,\u201A,\u2019",
+        /* 142 */ "\u201E,\u201C,\u201D",
+        /* 143 */ "\u201D,\u201E,\u201C",
+        /* 144 */ "\u201C,\u201E,\u201D",
+        /* 145 */ "!fixedColumnOrder!5,!text/single_quotes,!text/single_angle_quotes",
+        /* 146 */ "!fixedColumnOrder!5,!text/double_quotes,!text/double_angle_quotes",
+        /* 147 */ "!fixedColumnOrder!6,!text/double_quotes,!text/single_quotes,!text/double_angle_quotes,!text/single_angle_quotes",
     };
 
     /* Language af: Afrikaans */
diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index 3725677..7124c4c 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -23,6 +23,7 @@
 import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.ProximityInfo;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
+import com.android.inputmethod.latin.personalization.DynamicPersonalizationDictionaryWriter;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 
 import java.io.File;
@@ -118,10 +119,9 @@
     }
 
     private static AbstractDictionaryWriter getDictionaryWriter(final Context context,
-            final String dictType, final boolean isUpdatable) {
-        if (isUpdatable) {
-            // TODO: Employ dynamically updatable DictionaryWriter.
-            return new DictionaryWriter(context, dictType);
+            final String dictType, final boolean isDynamicPersonalizationDictionary) {
+        if (isDynamicPersonalizationDictionary) {
+            return new DynamicPersonalizationDictionaryWriter(context, dictType);
         } else {
             return new DictionaryWriter(context, dictType);
         }
@@ -145,6 +145,7 @@
         mIsUpdatable = isUpdatable;
         mBinaryDictionary = null;
         mSharedDictionaryController = getSharedDictionaryController(filename);
+        // Currently, only dynamic personalization dictionary is updatable.
         mDictionaryWriter = getDictionaryWriter(context, dictType, isUpdatable);
     }
 
diff --git a/java/src/com/android/inputmethod/latin/ExpandableDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
index fc87cfa..491964f 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
@@ -327,7 +327,7 @@
         return (node == null) ? false : !node.mShortcutOnly;
     }
 
-    protected boolean removeBigram(final String word1, final String word2) {
+    public boolean removeBigram(final String word1, final String word2) {
         // Refer to addOrSetBigram() about word1.toLowerCase()
         final Node firstWord = searchWord(mRoots, word1.toLowerCase(), 0, null);
         final Node secondWord = searchWord(mRoots, word2, 0, null);
@@ -359,7 +359,7 @@
         return (node == null) ? -1 : node.mFrequency;
     }
 
-    protected NextWord getBigramWord(final String word1, final String word2) {
+    public NextWord getBigramWord(final String word1, final String word2) {
         // Refer to addOrSetBigram() about word1.toLowerCase()
         final Node firstWord = searchWord(mRoots, word1.toLowerCase(), 0, null);
         final Node secondWord = searchWord(mRoots, word2, 0, null);
@@ -700,7 +700,7 @@
         return null;
     }
 
-    protected void clearDictionary() {
+    public void clearDictionary() {
         mRoots = new NodeArray();
     }
 
diff --git a/java/src/com/android/inputmethod/latin/personalization/DynamicPersonalizationDictionaryWriter.java b/java/src/com/android/inputmethod/latin/personalization/DynamicPersonalizationDictionaryWriter.java
new file mode 100644
index 0000000..a1d93ef
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/personalization/DynamicPersonalizationDictionaryWriter.java
@@ -0,0 +1,159 @@
+/*
+ * 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.latin.personalization;
+
+import android.content.Context;
+
+import com.android.inputmethod.keyboard.ProximityInfo;
+import com.android.inputmethod.latin.AbstractDictionaryWriter;
+import com.android.inputmethod.latin.ExpandableDictionary;
+import com.android.inputmethod.latin.WordComposer;
+import com.android.inputmethod.latin.ExpandableDictionary.NextWord;
+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.UnsupportedFormatException;
+import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils;
+import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.BigramDictionaryInterface;
+import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils;
+import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils.ForgettingCurveParams;
+
+import java.io.IOException;
+import java.util.ArrayList;
+
+// Currently this class is used to implement dynamic prodiction dictionary.
+// TODO: Move to native code.
+public class DynamicPersonalizationDictionaryWriter extends AbstractDictionaryWriter {
+    private static final String TAG = DynamicPersonalizationDictionaryWriter.class.getSimpleName();
+    /** Maximum number of pairs. Pruning will start when databases goes above this number. */
+    public static final int MAX_HISTORY_BIGRAMS = 10000;
+
+    /** Any pair being typed or picked */
+    private static final int FREQUENCY_FOR_TYPED = 2;
+
+    private static final int BINARY_DICT_VERSION = 3;
+    private static final FormatSpec.FormatOptions FORMAT_OPTIONS =
+            new FormatSpec.FormatOptions(BINARY_DICT_VERSION, true /* supportsDynamicUpdate */);
+
+    private final UserHistoryDictionaryBigramList mBigramList =
+            new UserHistoryDictionaryBigramList();
+    private final ExpandableDictionary mExpandableDictionary;
+
+    public DynamicPersonalizationDictionaryWriter(final Context context, final String dictType) {
+        super(context, dictType);
+        mExpandableDictionary = new ExpandableDictionary(context, dictType);
+    }
+
+    @Override
+    public void clear() {
+        mBigramList.evictAll();
+        mExpandableDictionary.clearDictionary();
+    }
+
+    /**
+     * Adds a word unigram to the fusion dictionary. Call updateBinaryDictionary when all changes
+     * are done to update the binary dictionary.
+     */
+    @Override
+    public void addUnigramWord(final String word, final String shortcutTarget, final int frequency,
+            final boolean isNotAWord) {
+        mExpandableDictionary.addWord(word, shortcutTarget, frequency);
+        mBigramList.addBigram(null, word, (byte)frequency);
+    }
+
+    @Override
+    public void addBigramWords(final String word0, final String word1, final int frequency,
+            final boolean isValid, final long lastModifiedTime) {
+        if (lastModifiedTime > 0) {
+            mExpandableDictionary.setBigramAndGetFrequency(word0, word1,
+                    new ForgettingCurveParams(frequency, System.currentTimeMillis(),
+                            lastModifiedTime));
+            mBigramList.addBigram(word0, word1, (byte)frequency);
+        } else {
+            mExpandableDictionary.setBigramAndGetFrequency(word0, word1,
+                    new ForgettingCurveParams(isValid));
+            mBigramList.addBigram(word0, word1, (byte)frequency);
+        }
+    }
+
+    @Override
+    public void removeBigramWords(final String word0, final String word1) {
+        if (mBigramList.removeBigram(word0, word1)) {
+            mExpandableDictionary.removeBigram(word0, word1);
+        }
+    }
+
+    @Override
+    protected void writeDictionary(final DictEncoder dictEncoder)
+            throws IOException, UnsupportedFormatException {
+        UserHistoryDictIOUtils.writeDictionary(dictEncoder,
+                new FrequencyProvider(mBigramList, mExpandableDictionary), mBigramList,
+                        FORMAT_OPTIONS);
+    }
+
+    private static class FrequencyProvider implements BigramDictionaryInterface {
+        final private UserHistoryDictionaryBigramList mBigramList;
+        final private ExpandableDictionary mExpandableDictionary;
+
+        public FrequencyProvider(final UserHistoryDictionaryBigramList bigramList,
+                final ExpandableDictionary expandableDictionary) {
+            mBigramList = bigramList;
+            mExpandableDictionary = expandableDictionary;
+        }
+        @Override
+        public int getFrequency(final String word0, final String word1) {
+            final int freq;
+            if (word0 == null) { // unigram
+                freq = FREQUENCY_FOR_TYPED;
+            } else { // bigram
+                final NextWord nw = mExpandableDictionary.getBigramWord(word0, word1);
+                if (nw != null) {
+                    final ForgettingCurveParams forgettingCurveParams = nw.getFcParams();
+                    final byte prevFc = mBigramList.getBigrams(word0).get(word1);
+                    final byte fc = forgettingCurveParams.getFc();
+                    final boolean isValid = forgettingCurveParams.isValid();
+                    if (prevFc > 0 && prevFc == fc) {
+                        freq = fc & 0xFF;
+                    } else if (UserHistoryForgettingCurveUtils.
+                            needsToSave(fc, isValid, mBigramList.size() <= MAX_HISTORY_BIGRAMS)) {
+                        freq = fc & 0xFF;
+                    } else {
+                        // Delete this entry
+                        freq = -1;
+                    }
+                } else {
+                    // Delete this entry
+                    freq = -1;
+                }
+            }
+            return freq;
+        }
+    }
+
+    @Override
+    public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
+            final String prevWord, final ProximityInfo proximityInfo,
+            boolean blockOffensiveWords) {
+        return mExpandableDictionary.getSuggestions(composer, prevWord, proximityInfo,
+                blockOffensiveWords);
+    }
+
+    @Override
+    public boolean isValidWord(final String word) {
+        return mExpandableDictionary.isValidWord(word);
+    }
+}
diff --git a/tools/make-keyboard-text/res/values/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values/donottranslate-more-keys.xml
index 349baba..fa9739b 100644
--- a/tools/make-keyboard-text/res/values/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values/donottranslate-more-keys.xml
@@ -185,10 +185,6 @@
     <string name="shortcut_as_more_key">!icon/shortcut_key|!code/key_shortcut</string>
     <string name="action_next_as_more_key">!hasLabels!,\@string/label_next_key|!code/key_action_next</string>
     <string name="action_previous_as_more_key">!hasLabels!,\@string/label_previous_key|!code/key_action_previous</string>
-    <!-- Label for "switch to more symbol" modifier key.  Must be short to fit on key! -->
-    <string name="label_to_more_symbol_key">= \\ &lt;</string>
-    <!-- Label for "switch to more symbol" modifier key on tablets.  Must be short to fit on key! -->
-    <string name="label_to_more_symbol_for_tablet_key">~ \\ {</string>
     <!-- Label for "Tab" key.  Must be short to fit on key! -->
     <string name="label_tab_key">Tab</string>
     <!-- Label for "switch to phone numeric" key.  Must be short to fit on key! -->