<snapdata remixID="8878895"><project name="U2L4-brickwall" app="Snap! 5.1, http://snap.berkeley.edu" version="1"><notes></notes><thumbnail>data:image/png;base64,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</thumbnail><stage name="Stage" width="480" height="360" costume="0" color="255,255,255,1" tempo="60" threadsafe="false" volume="100" pan="0" lines="flat" ternary="true" codify="false" inheritance="false" sublistIDs="false" scheduled="false" id="1"><pentrails>data:image/png;base64,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</pentrails><costumes><list struct="atomic" id="2"></list></costumes><sounds><list struct="atomic" id="3"></list></sounds><variables></variables><blocks></blocks><scripts></scripts><sprites><sprite name="Sprite" idx="1" x="-150" y="-50" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="0" color="145,26,68,1" pen="tip" id="8"><costumes><list struct="atomic" id="9"></list></costumes><sounds><list struct="atomic" id="10"></list></sounds><blocks></blocks><variables></variables><scripts><script x="15.666666666666629" y="144.33333333333337"><custom-block s="draw brick, length: %n width: %n"><l>30</l><l>10</l></custom-block></script><script x="95" y="361"><custom-block s="Draw Brick Wall With %s columns and %s rows"><l>10</l><l>10</l></custom-block></script><script x="26" y="45"><block s="clear"></block><block s="gotoXY"><l>-150</l><l>100</l></block></script><script x="35" y="236"><custom-block s="Half brick length: %s Width: %s"><l>30</l><l>10</l></custom-block></script></scripts></sprite><watcher var="y value" style="normal" x="10" y="10" color="243,118,29" hidden="true"/></sprites></stage><hidden></hidden><headers></headers><code></code><blocks><block-definition s="set flag %&apos;which&apos; to %&apos;tf&apos;" type="command" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%s" readonly="true"><options>Presentation mode&#xD;Retina display support&#xD;Long form input dialog&#xD;Plain prototype labels&#xD;Input sliders&#xD;Execute on slider change&#xD;Clicking sound&#xD;Turbo mode&#xD;Flat design&#xD;Keyboard editing&#xD;Table support&#xD;Table lines&#xD;Visible stepping&#xD;Thread safe scripts&#xD;Prefer smooth animations&#xD;Flat line ends&#xD;Codification support&#xD;Inheritance support</options></input><input type="%b"></input></inputs><script><block s="doRun"><block s="reportJSFunction"><list><l>which</l><l>tf</l></list><l>var   stage = this.parentThatIsA(StageMorph),&#xD;        ide = stage.parentThatIsA(IDE_Morph),&#xD;        world = stage.parentThatIsA(WorldMorph);&#xD;&#xD;if (tf != !!tf) return;&#xD;&#xD;try{&#xD;ide.savingPreferences = false;&#xD;&#xD;switch (which) {&#xD;    case &apos;Presentation mode&apos;:&#xD;        if (tf != ide.isAppMode) ide.toggleAppMode();&#xD;        break;&#xD;    case &apos;Retina display support&apos;:&#xD;        if (tf != isRetinaEnabled()) ide.toggleRetina();&#xD;        break;&#xD;    case &apos;Long form input dialog&apos;:&#xD;        if (tf != InputSlotDialogMorph.prototype.isLaunchingExpanded)&#xD;            ide.toggleLongFormInputDialog();&#xD;        break;&#xD;    case &apos;Plain prototype labels&apos;:&#xD;        if (tf != BlockLabelPlaceHolderMorph.prototype.plainLabel)&#xD;            ide.togglePlainPrototypeLabels();&#xD;        break;&#xD;    case &apos;Input sliders&apos;:&#xD;        MorphicPreferences.useSliderForInput = tf;&#xD;        break;&#xD;    case &apos;Execute on slider change&apos;:&#xD;        ArgMorph.prototype.executeOnSliderEdit = tf;&#xD;        break;&#xD;    case &apos;Clicking sound&apos;:&#xD;        if (tf != !!BlockMorph.prototype.snapSound)&#xD;            BlockMorph.prototype.toggleSnapSound();&#xD;        break;&#xD;    case &apos;Turbo mode&apos;:&#xD;        if (tf != stage.isFastTracked)&#xD;            ide.toggleFastTracking();&#xD;        break;&#xD;    case &apos;Flat design&apos;:&#xD;        if (tf == MorphicPreferences.isFlat) break;&#xD;        if (tf)&#xD;            ide.flatDesign();&#xD;        else&#xD;            ide.defaultDesign();&#xD;        break;&#xD;    case &apos;Keyboard editing&apos;:&#xD;            ScriptsMorph.prototype.enableKeyboard = tf;&#xD;        break;&#xD;    case &apos;Table support&apos;:&#xD;            List.prototype.enableTables = tf;&#xD;        break;&#xD;    case &apos;Table lines&apos;:&#xD;                TableMorph.prototype.highContrast = tf;&#xD;        break;&#xD;    case &apos;Visible stepping&apos;:&#xD;        if (tf != Process.prototype.enableSingleStepping)&#xD;            ide.toggleSingleStepping();&#xD;        break;&#xD;    case &apos;Thread safe scripts&apos;:&#xD;        stage.isThreadSafe = tf;&#xD;        break;&#xD;    case &apos;Prefer smooth animations&apos;:&#xD;        if (tf != (StageMorph.prototype.frameRate &gt; 0))&#xD;            ide.toggleVariableFrameRate();&#xD;        break;&#xD;    case &apos;Flat line ends&apos;:&#xD;        SpriteMorph.prototype.useFlatLineEnds = tf;&#xD;        break;&#xD;    case &apos;Codification support&apos;:&#xD;        if (tf != StageMorph.prototype.enableCodeMapping) {&#xD;            StageMorph.prototype.enableCodeMapping = tf;&#xD;            ide.currentSprite.blocksCache.variables = null;&#xD;            ide.currentSprite.paletteCache.variables = null;&#xD;            ide.refreshPalette();&#xD;        }&#xD;        break;&#xD;    case &apos;Inheritance support&apos;:&#xD;        if (tf != 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