diff --git a/java/res/values-ar/donottranslate-more-keys.xml b/java/res/values-ar/donottranslate-more-keys.xml
index 7d69d28..ecad0bb 100644
--- a/java/res/values-ar/donottranslate-more-keys.xml
+++ b/java/res/values-ar/donottranslate-more-keys.xml
@@ -70,17 +70,13 @@
     <!-- U+066B: "٫" ARABIC DECIMAL SEPARATOR
          U+066C: "٬" ARABIC THOUSANDS SEPARATOR -->
     <string name="additional_more_keys_for_symbols_0">0,&#x066B;,&#x066C;</string>
+    <!-- U+060C: "،" ARABIC COMMA -->
     <string name="keylabel_for_comma">&#x060C;</string>
-    <string name="keylabel_for_f1">&#x060C;</string>
+    <string name="more_keys_for_comma">"\\,"</string>
     <string name="keylabel_for_symbols_question">&#x061F;</string>
     <string name="keylabel_for_symbols_semicolon">&#x061B;</string>
     <!-- U+066A: "٪" ARABIC PERCENT SIGN -->
     <string name="keylabel_for_symbols_percent">&#x066A;</string>
-    <string name="more_keys_for_comma">,</string>
-    <!-- U+060C: "،" ARABIC COMMA -->
-    <string name="more_keys_for_f1">&#x060C;</string>
-    <string name="more_keys_for_f1_settings">\\,,\@icon/settingsKey|\@integer/key_settings</string>
-    <string name="more_keys_for_f1_navigate">\\,,\@icon/tabKey|\@integer/key_tab</string>
     <string name="more_keys_for_symbols_question">\?</string>
     <string name="more_keys_for_symbols_semicolon">;</string>
     <!-- U+2030: "‰" PER MILLE SIGN -->
diff --git a/java/res/values-sw600dp/config.xml b/java/res/values-sw600dp/config.xml
index ecc5b71..689b209 100644
--- a/java/res/values-sw600dp/config.xml
+++ b/java/res/values-sw600dp/config.xml
@@ -19,8 +19,6 @@
 -->
 
 <resources>
-    <bool name="config_enable_show_settings_key_option">true</bool>
-    <bool name="config_default_show_settings_key">false</bool>
     <bool name="config_enable_show_voice_key_option">false</bool>
     <bool name="config_enable_show_popup_on_keypress_option">false</bool>
     <bool name="config_enable_bigram_suggestions_option">false</bool>
diff --git a/java/res/values-sw768dp/config.xml b/java/res/values-sw768dp/config.xml
index c1f9179..d46e5f1 100644
--- a/java/res/values-sw768dp/config.xml
+++ b/java/res/values-sw768dp/config.xml
@@ -19,8 +19,6 @@
 -->
 
 <resources>
-    <bool name="config_enable_show_settings_key_option">false</bool>
-    <bool name="config_default_show_settings_key">true</bool>
     <bool name="config_enable_show_voice_key_option">false</bool>
     <bool name="config_enable_show_popup_on_keypress_option">false</bool>
     <bool name="config_enable_bigram_suggestions_option">false</bool>
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 2dea8fb..f91b0a3 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -357,14 +357,6 @@
         </attr>
         <attr name="navigateAction" format="boolean" />
         <attr name="passwordInput" format="boolean" />
-        <attr name="hasSettingsKey" format="boolean" />
-        <!-- This should be aligned with KeyboardID.F2KEY_MODE_* -->
-        <attr name="f2KeyMode" format="enum">
-            <enum name="none" value="0" />
-            <enum name="settings" value="1" />
-            <enum name="shortcutIme" value="2" />
-            <enum name="shortcutImeOrSettings" value="3" />
-        </attr>
         <attr name="clobberSettingsKey" format="boolean" />
         <attr name="shortcutKeyEnabled" format="boolean" />
         <attr name="hasShortcutKey" format="boolean" />
diff --git a/java/res/values/config.xml b/java/res/values/config.xml
index cb13ba3..9e962ee 100644
--- a/java/res/values/config.xml
+++ b/java/res/values/config.xml
@@ -20,8 +20,6 @@
 
 <resources>
     <bool name="config_use_fullscreen_mode">false</bool>
-    <bool name="config_enable_show_settings_key_option">true</bool>
-    <bool name="config_default_show_settings_key">false</bool>
     <bool name="config_enable_show_voice_key_option">true</bool>
     <bool name="config_enable_show_popup_on_keypress_option">true</bool>
     <bool name="config_enable_bigram_suggestions_option">true</bool>
diff --git a/java/res/values/donottranslate-more-keys.xml b/java/res/values/donottranslate-more-keys.xml
index 5b68f85..f1c2d2b 100644
--- a/java/res/values/donottranslate-more-keys.xml
+++ b/java/res/values/donottranslate-more-keys.xml
@@ -115,15 +115,12 @@
     <!-- U+207F: "ⁿ" SUPERSCRIPT LATIN SMALL LETTER N
          U+2205: "∅" EMPTY SET -->
     <string name="more_keys_for_symbols_0">&#x207F;,&#x2205;</string>
+    <string name="settings_as_more_key">\@icon/settingsKey|\@integer/key_settings</string>
     <string name="keylabel_for_comma">,</string>
-    <string name="keylabel_for_f1">,</string>
+    <string name="more_keys_for_comma"></string>
     <string name="keylabel_for_symbols_question">\?</string>
     <string name="keylabel_for_symbols_semicolon">;</string>
     <string name="keylabel_for_symbols_percent">%</string>
-    <string name="more_keys_for_comma"></string>
-    <string name="more_keys_for_f1"></string>
-    <string name="more_keys_for_f1_settings">\@icon/settingsKey|\@integer/key_settings</string>
-    <string name="more_keys_for_f1_navigate">\@icon/tabKey|\@integer/key_tab</string>
     <!-- U+00BF: "¿" INVERTED QUESTION MARK -->
     <string name="more_keys_for_symbols_question">&#x00BF;</string>
     <string name="more_keys_for_symbols_semicolon"></string>
diff --git a/java/res/values/strings.xml b/java/res/values/strings.xml
index c8b6421..516c607 100644
--- a/java/res/values/strings.xml
+++ b/java/res/values/strings.xml
@@ -95,9 +95,6 @@
     <string name="prefs_suggestion_visibility_show_only_portrait_name">Show on portrait mode</string>
     <string name="prefs_suggestion_visibility_hide_name">Always hide</string>
 
-    <!-- Option to show/hide the settings key -->
-    <string name="prefs_settings_key">Show settings key</string>
-
     <!-- Option to decide the auto correction threshold score -->
     <!-- Option to enable auto correction [CHAR LIMIT=20]-->
     <string name="auto_correction">Auto correction</string>
diff --git a/java/res/xml-sw600dp/key_f2.xml b/java/res/xml-sw600dp/key_f2.xml
deleted file mode 100644
index b25afc1..0000000
--- a/java/res/xml-sw600dp/key_f2.xml
+++ /dev/null
@@ -1,73 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2011, 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.
-*/
--->
-
-<merge
-    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
->
-    <switch>
-        <case
-            latin:f2KeyMode="settings"
-        >
-            <Key
-                latin:keyStyle="settingsKeyStyle"
-                latin:keyWidth="fillBoth" />
-        </case>
-        <case
-            latin:f2KeyMode="shortcutIme"
-        >
-            <switch>
-                <case
-                    latin:shortcutKeyEnabled="true"
-                >
-                    <Key
-                        latin:keyStyle="shortcutKeyStyle"
-                        latin:keyWidth="fillBoth" />
-                </case>
-                <!-- shortcutKeyEnabled="false" -->
-                <default>
-                    <Spacer />
-                </default>
-            </switch>
-        </case>
-        <case
-            latin:f2KeyMode="shortcutImeOrSettings"
-        >
-            <switch>
-                <case
-                    latin:shortcutKeyEnabled="true"
-                >
-                    <Key
-                        latin:keyStyle="shortcutKeyStyle"
-                        latin:keyWidth="fillBoth" />
-                </case>
-                <!-- shortcutKeyEnabled="false" -->
-                <default>
-                    <Key
-                        latin:keyStyle="settingsKeyStyle"
-                        latin:keyWidth="fillBoth" />
-                </default>
-            </switch>
-        </case>
-        <!-- f2KeyMode="none" -->
-        <default>
-            <Spacer />
-        </default>
-    </switch>
-</merge>
diff --git a/java/res/xml-sw600dp/key_shortcut.xml b/java/res/xml-sw600dp/key_shortcut.xml
new file mode 100644
index 0000000..8869ab9
--- /dev/null
+++ b/java/res/xml-sw600dp/key_shortcut.xml
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 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.
+*/
+-->
+
+<merge
+    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
+>
+    <switch>
+        <case
+            latin:shortcutKeyEnabled="true"
+            latin:clobberSettingsKey="false"
+        >
+            <Key
+                latin:keyStyle="shortcutKeyStyle"
+                latin:keyLabelFlags="hasPopupHint"
+                latin:moreKeys="@string/settings_as_more_key"
+                latin:keyWidth="fillBoth" />
+        </case>
+        <case
+            latin:shortcutKeyEnabled="true"
+            latin:clobberSettingsKey="true"
+        >
+            <Key
+                latin:keyStyle="shortcutKeyStyle"
+                latin:keyWidth="fillBoth" />
+        </case>
+        <case
+            latin:shortcutKeyEnabled="false"
+            latin:clobberSettingsKey="false"
+        >
+            <Key
+                latin:keyStyle="settingsKeyStyle"
+                latin:keyWidth="fillBoth" />
+        </case>
+        <!-- shortcutKeyEnabled="false" clobberSettingsKey="true" -->
+        <default>
+            <Spacer />
+        </default>
+    </switch>
+</merge>
diff --git a/java/res/xml-sw600dp/key_styles_common.xml b/java/res/xml-sw600dp/key_styles_common.xml
index 70fc289..bb75b1c 100644
--- a/java/res/xml-sw600dp/key_styles_common.xml
+++ b/java/res/xml-sw600dp/key_styles_common.xml
@@ -21,23 +21,6 @@
 <merge
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
 >
-    <!-- Base key style for the key which may have settings key as popup key -->
-    <switch>
-        <case
-            latin:clobberSettingsKey="true"
-        >
-            <key-style
-                latin:styleName="f2PopupStyle"
-                latin:backgroundType="functional" />
-        </case>
-        <default>
-            <key-style
-                latin:styleName="f2PopupStyle"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="\@icon/settingsKey|\@integer/key_settings"
-                latin:backgroundType="functional" />
-        </default>
-    </switch>
     <switch>
         <case
             latin:keyboardSetElement="alphabetManualShifted|alphabetShiftLockShifted"
@@ -112,7 +95,7 @@
         latin:keyIconDisabled="iconDisabledShortcutKey"
         latin:keyLabelFlags="preserveCase"
         latin:keyActionFlags="noKeyPreview|altCodeWhileTyping"
-        latin:parentStyle="f2PopupStyle" />
+        latin:backgroundType="functional" />
     <key-style
         latin:styleName="settingsKeyStyle"
         latin:code="@integer/key_settings"
diff --git a/java/res/xml-sw600dp/row_qwerty4.xml b/java/res/xml-sw600dp/row_qwerty4.xml
index b06508e..3c2f06d 100644
--- a/java/res/xml-sw600dp/row_qwerty4.xml
+++ b/java/res/xml-sw600dp/row_qwerty4.xml
@@ -71,6 +71,6 @@
             latin:keyXPos="-10.00%p"
             latin:keyWidth="0%p" />
         <include
-            latin:keyboardLayout="@xml/key_f2" />
+            latin:keyboardLayout="@xml/key_shortcut" />
     </Row>
 </merge>
diff --git a/java/res/xml-sw600dp/rows_number_normal.xml b/java/res/xml-sw600dp/rows_number_normal.xml
index 3141bbd..1c38a62 100644
--- a/java/res/xml-sw600dp/rows_number_normal.xml
+++ b/java/res/xml-sw600dp/rows_number_normal.xml
@@ -133,6 +133,6 @@
             latin:keyXPos="-11.00%p"
             latin:keyWidth="0%p" />
         <include
-            latin:keyboardLayout="@xml/key_f2" />
+            latin:keyboardLayout="@xml/key_shortcut" />
     </Row>
 </merge>
diff --git a/java/res/xml-sw600dp/rows_number_password.xml b/java/res/xml-sw600dp/rows_number_password.xml
index 0a71f74..59279fb 100644
--- a/java/res/xml-sw600dp/rows_number_password.xml
+++ b/java/res/xml-sw600dp/rows_number_password.xml
@@ -76,6 +76,6 @@
             latin:keyXPos="-11.00%p"
             latin:keyWidth="0%p" />
         <include
-            latin:keyboardLayout="@xml/key_f2" />
+            latin:keyboardLayout="@xml/key_shortcut" />
     </Row>
 </merge>
diff --git a/java/res/xml-sw600dp/rows_phone.xml b/java/res/xml-sw600dp/rows_phone.xml
index d61b4b2..4c896e9 100644
--- a/java/res/xml-sw600dp/rows_phone.xml
+++ b/java/res/xml-sw600dp/rows_phone.xml
@@ -127,6 +127,6 @@
             latin:keyXPos="-11.00%p"
             latin:keyWidth="0%p" />
         <include
-            latin:keyboardLayout="@xml/key_f2" />
+            latin:keyboardLayout="@xml/key_shortcut" />
     </Row>
 </merge>
diff --git a/java/res/xml-sw600dp/rows_symbols.xml b/java/res/xml-sw600dp/rows_symbols.xml
index 61a5644..96695e8 100644
--- a/java/res/xml-sw600dp/rows_symbols.xml
+++ b/java/res/xml-sw600dp/rows_symbols.xml
@@ -167,6 +167,6 @@
             latin:keyXPos="-10.00%p"
             latin:keyWidth="0%p" />
         <include
-            latin:keyboardLayout="@xml/key_f2" />
+            latin:keyboardLayout="@xml/key_shortcut" />
     </Row>
 </merge>
diff --git a/java/res/xml-sw600dp/rows_symbols_shift.xml b/java/res/xml-sw600dp/rows_symbols_shift.xml
index 05824b9..c5eee62 100644
--- a/java/res/xml-sw600dp/rows_symbols_shift.xml
+++ b/java/res/xml-sw600dp/rows_symbols_shift.xml
@@ -148,6 +148,6 @@
             latin:keyXPos="-10.00%p"
             latin:keyWidth="0%p" />
         <include
-            latin:keyboardLayout="@xml/key_f2" />
+            latin:keyboardLayout="@xml/key_shortcut" />
     </Row>
 </merge>
diff --git a/java/res/xml-sw768dp/key_settings.xml b/java/res/xml-sw768dp/key_settings.xml
new file mode 100644
index 0000000..0359a99
--- /dev/null
+++ b/java/res/xml-sw768dp/key_settings.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 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.
+*/
+-->
+
+<merge
+    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
+>
+    <switch>
+        <case
+            latin:clobberSettingsKey="false"
+        >
+            <Key
+                latin:keyStyle="settingsKeyStyle" />
+        </case>
+        <default>
+            <Spacer />
+        </default>
+    </switch>
+ </merge>
diff --git a/java/res/xml-sw768dp/row_qwerty4.xml b/java/res/xml-sw768dp/row_qwerty4.xml
index 84c4a37..24c081e 100644
--- a/java/res/xml-sw768dp/row_qwerty4.xml
+++ b/java/res/xml-sw768dp/row_qwerty4.xml
@@ -24,15 +24,8 @@
     <Row
         latin:keyWidth="8.047%p"
     >
-        <switch>
-            <case
-                latin:hasSettingsKey="true"
-            >
-                <Key
-                    latin:keyStyle="settingsKeyStyle"
-                    latin:keyWidth="8.047%p" />
-            </case>
-        </switch>
+        <include
+            latin:keyboardLayout="@xml/key_settings" />
         <Spacer
             latin:keyXPos="15.157%p"
             latin:keyWidth="0%p" />
diff --git a/java/res/xml-sw768dp/rows_number_normal.xml b/java/res/xml-sw768dp/rows_number_normal.xml
index cf947ab..60674cd 100644
--- a/java/res/xml-sw768dp/rows_number_normal.xml
+++ b/java/res/xml-sw768dp/rows_number_normal.xml
@@ -115,18 +115,9 @@
             latin:keyWidth="0%p" />
     </Row>
     <Row>
-        <switch>
-            <case latin:hasSettingsKey="true">
-                <Key
-                    latin:keyStyle="settingsKeyStyle"
-                    latin:keyWidth="8.047%p" />
-            </case>
-            <default>
-                <!-- Note: This Spacer prevents the below key from being marked as a left edge key. -->
-                <Spacer
-                    latin:keyWidth="8.047%p" />
-            </default>
-        </switch>
+        <include
+            latin:keyboardLayout="@xml/key_settings"
+            latin:keyWidth="8.047%p" />
         <Key
             latin:keyStyle="nonSpecialBackgroundSpaceKeyStyle"
             latin:keyXPos="13.829%p"
diff --git a/java/res/xml-sw768dp/rows_phone.xml b/java/res/xml-sw768dp/rows_phone.xml
index 0404bb1..69c9e86 100644
--- a/java/res/xml-sw768dp/rows_phone.xml
+++ b/java/res/xml-sw768dp/rows_phone.xml
@@ -110,18 +110,9 @@
             latin:keyWidth="0%p" />
     </Row>
     <Row>
-        <switch>
-            <case latin:hasSettingsKey="true">
-                <Key
-                    latin:keyStyle="settingsKeyStyle"
-                    latin:keyWidth="8.047%p" />
-            </case>
-            <default>
-                <!-- Note: This Spacer prevents the below key from being marked as a left edge key. -->
-                <Spacer
-                    latin:keyWidth="8.047%p" />
-            </default>
-        </switch>
+        <include
+            latin:keyboardLayout="@xml/key_settings"
+            latin:keyWidth="8.047%p" />
         <Key
             latin:keyStyle="nonSpecialBackgroundSpaceKeyStyle"
             latin:keyXPos="13.829%p"
diff --git a/java/res/xml-sw768dp/rows_symbols.xml b/java/res/xml-sw768dp/rows_symbols.xml
index a327684..96a86ec 100644
--- a/java/res/xml-sw768dp/rows_symbols.xml
+++ b/java/res/xml-sw768dp/rows_symbols.xml
@@ -155,15 +155,8 @@
     <Row
         latin:keyWidth="8.047%p"
     >
-        <switch>
-            <case
-                latin:hasSettingsKey="true"
-            >
-                <Key
-                    latin:keyStyle="settingsKeyStyle"
-                    latin:keyWidth="8.047%p" />
-            </case>
-        </switch>
+        <include
+            latin:keyboardLayout="@xml/key_settings" />
         <Key
             latin:keyLabel="/"
             latin:keyXPos="15.157%p" />
diff --git a/java/res/xml-sw768dp/rows_symbols_shift.xml b/java/res/xml-sw768dp/rows_symbols_shift.xml
index 4c80771..8c1bef4 100644
--- a/java/res/xml-sw768dp/rows_symbols_shift.xml
+++ b/java/res/xml-sw768dp/rows_symbols_shift.xml
@@ -145,13 +145,8 @@
     <Row
         latin:keyWidth="8.047%p"
     >
-        <switch>
-            <case latin:hasSettingsKey="true">
-                <Key
-                    latin:keyStyle="settingsKeyStyle"
-                    latin:keyWidth="8.047%p" />
-            </case>
-        </switch>
+        <include
+            latin:keyboardLayout="@xml/key_settings" />
         <Key
             latin:keyStyle="spaceKeyStyle"
             latin:keyXPos="31.250%p"
diff --git a/java/res/xml/key_f1.xml b/java/res/xml/key_f1.xml
index 83b6ecc..6068d25 100644
--- a/java/res/xml/key_f1.xml
+++ b/java/res/xml/key_f1.xml
@@ -23,7 +23,6 @@
 >
     <switch>
         <case
-            latin:hasSettingsKey="false"
             latin:navigateAction="false"
         >
             <switch>
@@ -51,11 +50,14 @@
                 <default>
                     <Key
                         latin:keyLabel="@string/keylabel_for_comma"
+                        latin:keyLabelFlags="hasPopupHint"
+                        latin:additionalMoreKeys="@string/more_keys_for_comma"
                         latin:keyStyle="f1PopupStyle" />
                 </default>
             </switch>
         </case>
-        <!-- hasSettingsKey="true" or navigateAction="true" -->
+        <!-- TODO: Remove dedicated navigation tab key. -->
+        <!-- navigateAction="true" -->
         <default>
             <switch>
                 <case
@@ -85,9 +87,10 @@
                 <default>
                     <Key
                         latin:keyLabel="@string/keylabel_for_comma"
-                        latin:keyWidth="9.2%p"
-                        latin:keyStyle="f1PopupStyle" />
-                </default>
+                        latin:additionalMoreKeys="@string/more_keys_for_comma"
+                        latin:keyStyle="f1PopupStyle"
+                        latin:keyWidth="9.2%p" />
+                    </default>
             </switch>
         </default>
     </switch>
diff --git a/java/res/xml/key_settings_or_tab.xml b/java/res/xml/key_navigation_tab.xml
similarity index 70%
rename from java/res/xml/key_settings_or_tab.xml
rename to java/res/xml/key_navigation_tab.xml
index 2d35e3b..c77189f 100644
--- a/java/res/xml/key_settings_or_tab.xml
+++ b/java/res/xml/key_navigation_tab.xml
@@ -23,17 +23,6 @@
 >
     <switch>
         <case
-            latin:hasSettingsKey="true"
-        >
-            <!-- Because this settings key is not adjacent to the space key, this key should be
-                 just ignored while typing (altCode=CODE_UNSPECIFIED). -->
-            <Key
-                latin:keyStyle="settingsKeyStyle"
-                latin:altCode="@integer/key_unspecified"
-                latin:keyWidth="9.2%p" />
-        </case>
-        <!-- hasSettingsKey="false" -->
-        <case
             latin:navigateAction="true"
         >
             <Key
diff --git a/java/res/xml/key_styles_common.xml b/java/res/xml/key_styles_common.xml
index 4d0ad29..eabbdb3 100644
--- a/java/res/xml/key_styles_common.xml
+++ b/java/res/xml/key_styles_common.xml
@@ -28,36 +28,14 @@
         >
             <key-style
                 latin:styleName="f1PopupStyle"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="@string/more_keys_for_f1"
                 latin:backgroundType="functional" />
         </case>
-        <!-- clobberSettingsKey="false -->
-        <case
-            latin:hasSettingsKey="false"
-        >
-            <key-style
-                latin:styleName="f1PopupStyle"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="@string/more_keys_for_f1_settings"
-                latin:backgroundType="functional" />
-        </case>
-        <!-- clobberSettingsKey="false" hasSettingsKey="true" -->
-        <case
-            latin:navigateAction="true"
-        >
-            <key-style
-                latin:styleName="f1PopupStyle"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="@string/more_keys_for_f1_navigate"
-                latin:backgroundType="functional" />
-        </case>
-        <!-- clobberSettingsKey="false" and hasSettingsKey="true" navigateAction="false" -->
+        <!-- clobberSettingsKey="false" -->
         <default>
             <key-style
                 latin:styleName="f1PopupStyle"
                 latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="@string/more_keys_for_f1"
+                latin:moreKeys="@string/settings_as_more_key"
                 latin:backgroundType="functional" />
         </default>
     </switch>
diff --git a/java/res/xml/key_symbols_f1.xml b/java/res/xml/key_symbols_f1.xml
index 0dd3d91..ac4031f 100644
--- a/java/res/xml/key_symbols_f1.xml
+++ b/java/res/xml/key_symbols_f1.xml
@@ -23,7 +23,6 @@
 >
     <switch>
         <case
-            latin:hasSettingsKey="false"
             latin:navigateAction="false"
         >
             <switch>
@@ -36,12 +35,14 @@
                 <!-- latin:hasShortcutKey="false" -->
                 <default>
                     <Key
-                        latin:keyLabel="@string/keylabel_for_f1"
+                        latin:keyLabel="@string/keylabel_for_comma"
+                        latin:keyLabelFlags="hasPopupHint"
+                        latin:additionalMoreKeys="@string/more_keys_for_comma"
                         latin:keyStyle="f1PopupStyle" />
                 </default>
             </switch>
         </case>
-        <!-- hasSettingsKey="true" or navigateAction="true" -->
+        <!-- navigateAction="true" -->
         <default>
             <switch>
                 <case
@@ -54,10 +55,12 @@
                 <!-- latin:hasShortcutKey="false" -->
                 <default>
                     <Key
-                        latin:keyLabel="@string/keylabel_for_f1"
-                        latin:keyWidth="9.2%p"
-                        latin:keyStyle="f1PopupStyle" />
-                </default>
+                        latin:keyLabel="@string/keylabel_for_comma"
+                        latin:keyLabelFlags="hasPopupHint"
+                        latin:additionalMoreKeys="@string/more_keys_for_comma"
+                        latin:keyStyle="f1PopupStyle"
+                        latin:keyWidth="9.2%p" />
+                    </default>
             </switch>
         </default>
     </switch>
diff --git a/java/res/xml/prefs.xml b/java/res/xml/prefs.xml
index 77f4650..f826ef0 100644
--- a/java/res/xml/prefs.xml
+++ b/java/res/xml/prefs.xml
@@ -44,11 +44,6 @@
             android:title="@string/popup_on_keypress"
             android:persistent="true"
             android:defaultValue="@bool/config_default_popup_preview" />
-        <CheckBoxPreference
-            android:key="show_settings_key"
-            android:title="@string/prefs_settings_key"
-            android:persistent="true"
-            android:defaultValue="@bool/config_default_show_settings_key" />
         <ListPreference
             android:key="voice_mode"
             android:title="@string/voice_input"
diff --git a/java/res/xml/row_qwerty4.xml b/java/res/xml/row_qwerty4.xml
index 8c20a72..2f8b82c 100644
--- a/java/res/xml/row_qwerty4.xml
+++ b/java/res/xml/row_qwerty4.xml
@@ -26,7 +26,6 @@
     >
         <switch>
             <case
-                latin:hasSettingsKey="false"
                 latin:navigateAction="false"
             >
                 <Key
@@ -43,13 +42,14 @@
                     latin:keyStyle="enterKeyStyle"
                     latin:keyWidth="fillRight" />
             </case>
-            <!-- hasSettingsKey="true" or navigateAction="true" -->
+            <!-- TODO: Remove dedicated navigation tab key. -->
+            <!-- navigateAction="true" -->
             <default>
                 <Key
                     latin:keyStyle="toSymbolKeyStyle"
                     latin:keyWidth="13.75%p" />
                 <include
-                    latin:keyboardLayout="@xml/key_settings_or_tab" />
+                    latin:keyboardLayout="@xml/key_navigation_tab" />
                 <include
                     latin:keyboardLayout="@xml/key_f1" />
                 <Key
diff --git a/java/res/xml/row_symbols4.xml b/java/res/xml/row_symbols4.xml
index be0c94f..ef77bc3 100644
--- a/java/res/xml/row_symbols4.xml
+++ b/java/res/xml/row_symbols4.xml
@@ -26,7 +26,6 @@
     >
         <switch>
             <case
-                latin:hasSettingsKey="false"
                 latin:navigateAction="false"
             >
                 <Key
@@ -43,13 +42,14 @@
                     latin:keyStyle="enterKeyStyle"
                     latin:keyWidth="fillRight" />
             </case>
-            <!-- hasSettingsKey="true" or navigateAction="true" -->
+            <!-- TODO: Remove dedicated navigation tab key. -->
+            <!-- navigateAction="true" -->
             <default>
                 <Key
                     latin:keyStyle="toAlphaKeyStyle"
                     latin:keyWidth="13.75%p" />
                 <include
-                    latin:keyboardLayout="@xml/key_settings_or_tab" />
+                    latin:keyboardLayout="@xml/key_navigation_tab" />
                 <include
                     latin:keyboardLayout="@xml/key_f1" />
                 <Key
diff --git a/java/res/xml/row_symbols_shift4.xml b/java/res/xml/row_symbols_shift4.xml
index 5cb6512..632aafc 100644
--- a/java/res/xml/row_symbols_shift4.xml
+++ b/java/res/xml/row_symbols_shift4.xml
@@ -26,7 +26,6 @@
     >
         <switch>
             <case
-                latin:hasSettingsKey="false"
                 latin:navigateAction="false"
             >
                 <Key
@@ -51,13 +50,14 @@
                     latin:keyStyle="enterKeyStyle"
                     latin:keyWidth="fillRight" />
             </case>
-            <!-- hasSettingsKey="true" or navigateAction="true" -->
+            <!-- TODO: Remove dedicated navigation tab key. -->
+            <!-- navigateAction="true" -->
             <default>
                 <Key
                     latin:keyStyle="toAlphaKeyStyle"
                     latin:keyWidth="13.75%p" />
                 <include
-                    latin:keyboardLayout="@xml/key_settings_or_tab" />
+                    latin:keyboardLayout="@xml/key_navigation_tab" />
                 <!-- U+201F: "‟" DOUBLE HIGH-REVERSED-9 QUOTATION MARK -->
                 <!-- TODO: Neither DroidSans nor Roboto have the glyph for U+201F DOUBLE HIGH-REVERSED-9 QUOTATION MARK. -->
                     <!-- latin:keyLabelFlags="hasPopupHint" -->
diff --git a/java/src/com/android/inputmethod/keyboard/Keyboard.java b/java/src/com/android/inputmethod/keyboard/Keyboard.java
index 28f71f4..60e5069 100644
--- a/java/src/com/android/inputmethod/keyboard/Keyboard.java
+++ b/java/src/com/android/inputmethod/keyboard/Keyboard.java
@@ -1073,10 +1073,6 @@
                         R.styleable.Keyboard_Case_navigateAction, id.navigateAction());
                 final boolean passwordInputMatched = matchBoolean(a,
                         R.styleable.Keyboard_Case_passwordInput, id.passwordInput());
-                final boolean hasSettingsKeyMatched = matchBoolean(a,
-                        R.styleable.Keyboard_Case_hasSettingsKey, id.hasSettingsKey());
-                final boolean f2KeyModeMatched = matchInteger(a,
-                        R.styleable.Keyboard_Case_f2KeyMode, id.f2KeyMode());
                 final boolean clobberSettingsKeyMatched = matchBoolean(a,
                         R.styleable.Keyboard_Case_clobberSettingsKey, id.mClobberSettingsKey);
                 final boolean shortcutKeyEnabledMatched = matchBoolean(a,
@@ -1094,14 +1090,13 @@
                 final boolean countryCodeMatched = matchString(a,
                         R.styleable.Keyboard_Case_countryCode, id.mLocale.getCountry());
                 final boolean selected = keyboardSetElementMatched && modeMatched
-                        && navigateActionMatched && passwordInputMatched && hasSettingsKeyMatched
-                        && f2KeyModeMatched && clobberSettingsKeyMatched
-                        && shortcutKeyEnabledMatched && hasShortcutKeyMatched && isMultiLineMatched
-                        && imeActionMatched && localeCodeMatched && languageCodeMatched
-                        && countryCodeMatched;
+                        && navigateActionMatched && passwordInputMatched
+                        && clobberSettingsKeyMatched && shortcutKeyEnabledMatched
+                        && hasShortcutKeyMatched && isMultiLineMatched && imeActionMatched
+                        && localeCodeMatched && languageCodeMatched && countryCodeMatched;
 
                 if (DEBUG) {
-                    startTag("<%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s>%s", TAG_CASE,
+                    startTag("<%s%s%s%s%s%s%s%s%s%s%s%s%s>%s", TAG_CASE,
                             textAttr(a.getString(R.styleable.Keyboard_Case_keyboardSetElement),
                                     "keyboardSetElement"),
                             textAttr(a.getString(R.styleable.Keyboard_Case_mode), "mode"),
@@ -1109,11 +1104,6 @@
                                     "navigateAction"),
                             booleanAttr(a, R.styleable.Keyboard_Case_passwordInput,
                                     "passwordInput"),
-                            booleanAttr(a, R.styleable.Keyboard_Case_hasSettingsKey,
-                                    "hasSettingsKey"),
-                            textAttr(KeyboardId.f2KeyModeName(
-                                    a.getInt(R.styleable.Keyboard_Case_f2KeyMode, -1)),
-                                    "f2KeyMode"),
                             booleanAttr(a, R.styleable.Keyboard_Case_clobberSettingsKey,
                                     "clobberSettingsKey"),
                             booleanAttr(a, R.styleable.Keyboard_Case_shortcutKeyEnabled,
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardId.java b/java/src/com/android/inputmethod/keyboard/KeyboardId.java
index 3ab2493..a75caf2 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardId.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardId.java
@@ -48,11 +48,6 @@
     public static final int ELEMENT_PHONE_SYMBOLS = 8;
     public static final int ELEMENT_NUMBER = 9;
 
-    private static final int F2KEY_MODE_NONE = 0;
-    private static final int F2KEY_MODE_SETTINGS = 1;
-    private static final int F2KEY_MODE_SHORTCUT_IME = 2;
-    private static final int F2KEY_MODE_SHORTCUT_IME_OR_SETTINGS = 3;
-
     private static final int IME_ACTION_CUSTOM_LABEL = EditorInfo.IME_MASK_ACTION + 1;
 
     public final Locale mLocale;
@@ -61,7 +56,6 @@
     public final int mMode;
     public final int mElementId;
     private final EditorInfo mEditorInfo;
-    private final boolean mSettingsKeyEnabled;
     public final boolean mClobberSettingsKey;
     public final boolean mShortcutKeyEnabled;
     public final boolean mHasShortcutKey;
@@ -70,15 +64,14 @@
     private final int mHashCode;
 
     public KeyboardId(int elementId, Locale locale, int orientation, int width, int mode,
-            EditorInfo editorInfo, boolean settingsKeyEnabled, boolean clobberSettingsKey,
-            boolean shortcutKeyEnabled, boolean hasShortcutKey) {
+            EditorInfo editorInfo, boolean clobberSettingsKey, boolean shortcutKeyEnabled,
+            boolean hasShortcutKey) {
         this.mLocale = locale;
         this.mOrientation = orientation;
         this.mWidth = width;
         this.mMode = mode;
         this.mElementId = elementId;
         this.mEditorInfo = editorInfo;
-        this.mSettingsKeyEnabled = settingsKeyEnabled;
         this.mClobberSettingsKey = clobberSettingsKey;
         this.mShortcutKeyEnabled = shortcutKeyEnabled;
         this.mHasShortcutKey = hasShortcutKey;
@@ -96,7 +89,6 @@
                 id.mWidth,
                 id.navigateAction(),
                 id.passwordInput(),
-                id.mSettingsKeyEnabled,
                 id.mClobberSettingsKey,
                 id.mShortcutKeyEnabled,
                 id.mHasShortcutKey,
@@ -116,7 +108,6 @@
                 && other.mWidth == this.mWidth
                 && other.navigateAction() == this.navigateAction()
                 && other.passwordInput() == this.passwordInput()
-                && other.mSettingsKeyEnabled == this.mSettingsKeyEnabled
                 && other.mClobberSettingsKey == this.mClobberSettingsKey
                 && other.mShortcutKeyEnabled == this.mShortcutKeyEnabled
                 && other.mHasShortcutKey == this.mHasShortcutKey
@@ -183,25 +174,6 @@
         }
     }
 
-    public boolean hasSettingsKey() {
-        return mSettingsKeyEnabled && !mClobberSettingsKey;
-    }
-
-    public int f2KeyMode() {
-        if (mClobberSettingsKey) {
-            // Never shows the Settings key
-            return KeyboardId.F2KEY_MODE_SHORTCUT_IME;
-        }
-
-        if (mSettingsKeyEnabled) {
-            return KeyboardId.F2KEY_MODE_SETTINGS;
-        } else {
-            // It should be alright to fall back to the Settings key on 7-inch layouts
-            // even when the Settings key is not explicitly enabled.
-            return KeyboardId.F2KEY_MODE_SHORTCUT_IME_OR_SETTINGS;
-        }
-    }
-
     @Override
     public boolean equals(Object other) {
         return other instanceof KeyboardId && equals((KeyboardId) other);
@@ -214,17 +186,15 @@
 
     @Override
     public String toString() {
-        return String.format("[%s %s %s%d %s %s %s%s%s%s%s%s%s]",
+        return String.format("[%s %s %s%d %s %s %s%s%s%s%s]",
                 elementIdToName(mElementId),
                 mLocale,
                 (mOrientation == 1 ? "port" : "land"), mWidth,
                 modeName(mMode),
                 imeAction(),
-                f2KeyModeName(f2KeyMode()),
                 (mClobberSettingsKey ? " clobberSettingsKey" : ""),
                 (navigateAction() ? " navigateAction" : ""),
                 (passwordInput() ? " passwordInput" : ""),
-                (hasSettingsKey() ? " hasSettingsKey" : ""),
                 (mShortcutKeyEnabled ? " shortcutKeyEnabled" : ""),
                 (mHasShortcutKey ? " hasShortcutKey" : "")
         );
@@ -270,14 +240,4 @@
         return (actionId == IME_ACTION_CUSTOM_LABEL) ? "actionCustomLabel"
                 : EditorInfoCompatUtils.imeActionName(actionId);
     }
-
-    public static String f2KeyModeName(int f2KeyMode) {
-        switch (f2KeyMode) {
-        case F2KEY_MODE_NONE: return "none";
-        case F2KEY_MODE_SETTINGS: return "settings";
-        case F2KEY_MODE_SHORTCUT_IME: return "shortcutIme";
-        case F2KEY_MODE_SHORTCUT_IME_OR_SETTINGS: return "shortcutImeOrSettings";
-        default: return null;
-        }
-    }
 }
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardSet.java b/java/src/com/android/inputmethod/keyboard/KeyboardSet.java
index f27170a..6e62f74 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardSet.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardSet.java
@@ -98,7 +98,6 @@
         int mMode;
         EditorInfo mEditorInfo;
         boolean mTouchPositionCorrectionEnabled;
-        boolean mSettingsKeyEnabled;
         boolean mVoiceKeyEnabled;
         boolean mVoiceKeyOnMain;
         boolean mNoSettingsKey;
@@ -193,8 +192,8 @@
         final boolean hasShortcutKey = params.mVoiceKeyEnabled
                 && (isSymbols != params.mVoiceKeyOnMain);
         return new KeyboardId(keyboardSetElementId, params.mLocale, params.mOrientation,
-                params.mWidth, params.mMode, params.mEditorInfo, params.mSettingsKeyEnabled,
-                params.mNoSettingsKey, params.mVoiceKeyEnabled, hasShortcutKey);
+                params.mWidth, params.mMode, params.mEditorInfo, params.mNoSettingsKey,
+                params.mVoiceKeyEnabled, hasShortcutKey);
     }
 
     public static class Builder {
@@ -237,9 +236,7 @@
             return this;
         }
 
-        public Builder setOptions(boolean settingsKeyEnabled, boolean voiceKeyEnabled,
-                boolean voiceKeyOnMain) {
-            mParams.mSettingsKeyEnabled = settingsKeyEnabled;
+        public Builder setOptions(boolean voiceKeyEnabled, boolean voiceKeyOnMain) {
             @SuppressWarnings("deprecation")
             final boolean deprecatedNoMicrophone = Utils.inPrivateImeOptions(
                     null, LatinIME.IME_OPTION_NO_MICROPHONE_COMPAT, mEditorInfo);
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
index d5e5a4e..622e583 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
@@ -35,7 +35,6 @@
 import com.android.inputmethod.latin.LatinIME;
 import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.R;
-import com.android.inputmethod.latin.Settings;
 import com.android.inputmethod.latin.SettingsValues;
 import com.android.inputmethod.latin.SubtypeSwitcher;
 import com.android.inputmethod.latin.Utils;
@@ -133,7 +132,6 @@
                 mSubtypeSwitcher.currentSubtypeContainsExtraValueKey(
                         LatinIME.SUBTYPE_EXTRA_VALUE_SUPPORT_TOUCH_POSITION_CORRECTION));
         builder.setOptions(
-                settingsValues.isSettingsKeyEnabled(),
                 settingsValues.isVoiceKeyEnabled(editorInfo),
                 settingsValues.isVoiceKeyOnMain());
         mKeyboardSet = builder.build();
@@ -404,8 +402,6 @@
         if (PREF_KEYBOARD_LAYOUT.equals(key)) {
             final int themeIndex = getKeyboardThemeIndex(mInputMethodService, sharedPreferences);
             postSetInputView(createInputView(themeIndex, false));
-        } else if (Settings.PREF_SHOW_SETTINGS_KEY.equals(key)) {
-            postSetInputView(createInputView(mThemeIndex, true));
         }
     }
 
diff --git a/java/src/com/android/inputmethod/latin/Settings.java b/java/src/com/android/inputmethod/latin/Settings.java
index d323100..dfcb645 100644
--- a/java/src/com/android/inputmethod/latin/Settings.java
+++ b/java/src/com/android/inputmethod/latin/Settings.java
@@ -65,7 +65,6 @@
     public static final String PREF_VIBRATE_ON = "vibrate_on";
     public static final String PREF_SOUND_ON = "sound_on";
     public static final String PREF_POPUP_ON = "popup_on";
-    public static final String PREF_SHOW_SETTINGS_KEY = "show_settings_key";
     public static final String PREF_VOICE_MODE = "voice_mode";
     public static final String PREF_CORRECTION_SETTINGS = "correction_settings";
     public static final String PREF_CONFIGURE_DICTIONARIES_KEY = "configure_dictionaries_key";
@@ -96,7 +95,6 @@
     private PreferenceScreen mKeypressVibrationDurationSettingsPref;
     private PreferenceScreen mKeypressSoundVolumeSettingsPref;
     private ListPreference mVoicePreference;
-    private CheckBoxPreference mShowSettingsKeyPreference;
     private ListPreference mShowCorrectionSuggestionsPreference;
     private ListPreference mAutoCorrectionThresholdPreference;
     private ListPreference mKeyPreviewPopupDismissDelay;
@@ -147,7 +145,6 @@
         mInputLanguageSelection = (PreferenceScreen) findPreference(PREF_SUBTYPES_SETTINGS);
         mInputLanguageSelection.setOnPreferenceClickListener(this);
         mVoicePreference = (ListPreference) findPreference(PREF_VOICE_MODE);
-        mShowSettingsKeyPreference = (CheckBoxPreference) findPreference(PREF_SHOW_SETTINGS_KEY);
         mShowCorrectionSuggestionsPreference =
                 (ListPreference) findPreference(PREF_SHOW_SUGGESTIONS_SETTING);
         SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
@@ -178,10 +175,6 @@
         final PreferenceGroup miscSettings =
                 (PreferenceGroup) findPreference(PREF_MISC_SETTINGS);
 
-        if (!SettingsValues.isShowSettingsKeyOptionEnabled(res)) {
-            generalSettings.removePreference(mShowSettingsKeyPreference);
-        }
-
         final boolean showVoiceKeyOption = res.getBoolean(
                 R.bool.config_enable_show_voice_key_option);
         if (!showVoiceKeyOption) {
diff --git a/java/src/com/android/inputmethod/latin/SettingsValues.java b/java/src/com/android/inputmethod/latin/SettingsValues.java
index 6b65231..7a43cb8 100644
--- a/java/src/com/android/inputmethod/latin/SettingsValues.java
+++ b/java/src/com/android/inputmethod/latin/SettingsValues.java
@@ -49,7 +49,6 @@
     public final boolean mVibrateOn;
     public final boolean mSoundOn;
     public final boolean mKeyPreviewPopupOn;
-    private final boolean mShowSettingsKey;
     private final String mVoiceMode;
     private final String mAutoCorrectionThresholdRawValue;
     public final String mShowSuggestionsSetting;
@@ -118,7 +117,6 @@
         mSoundOn = prefs.getBoolean(Settings.PREF_SOUND_ON,
                 res.getBoolean(R.bool.config_default_sound_enabled));
         mKeyPreviewPopupOn = isKeyPreviewPopupEnabled(prefs, res);
-        mShowSettingsKey = isSettingsKeyShown(prefs, res);
         final String voiceModeMain = res.getString(R.string.voice_mode_main);
         final String voiceModeOff = res.getString(R.string.voice_mode_off);
         mVoiceMode = prefs.getString(Settings.PREF_VOICE_MODE, voiceModeMain);
@@ -202,19 +200,6 @@
         return wordSeparators;
     }
 
-    private static boolean isSettingsKeyShown(final SharedPreferences prefs, final Resources res) {
-        final boolean defaultShowSettingsKey = res.getBoolean(
-                R.bool.config_default_show_settings_key);
-        return isShowSettingsKeyOptionEnabled(res)
-                ? prefs.getBoolean(Settings.PREF_SHOW_SETTINGS_KEY, defaultShowSettingsKey)
-                : defaultShowSettingsKey;
-    }
-
-    public static boolean isShowSettingsKeyOptionEnabled(final Resources resources) {
-        // TODO: Read this once and for all into a public final member
-        return resources.getBoolean(R.bool.config_enable_show_settings_key_option);
-    }
-
     private static boolean isVibrateOn(final Context context, final SharedPreferences prefs,
             final Resources res) {
         final boolean hasVibrator = VibratorCompatWrapper.getInstance(context).hasVibrator();
@@ -306,10 +291,6 @@
         return autoCorrectionThreshold;
     }
 
-    public boolean isSettingsKeyEnabled() {
-        return mShowSettingsKey;
-    }
-
     public boolean isVoiceKeyEnabled(final EditorInfo editorInfo) {
         final boolean shortcutImeEnabled = SubtypeSwitcher.getInstance().isShortcutImeEnabled();
         final int inputType = (editorInfo != null) ? editorInfo.inputType : 0;