<snapdata remixID="8901568"><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="-135" heading="270" 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="305" y="10"><block s="receiveKey"><l><option>space</option></l></block><block s="clear"></block></script><script x="302" y="90"><block s="receiveGo"></block><block s="gotoXY"><l>150</l><l>0</l></block><block s="clear"></block><custom-block s="row A"></custom-block><block s="up"></block><block s="gotoXY"><l>150</l><l>-15</l></block><custom-block s="row B"></custom-block><block s="gotoXY"><l>150</l><l>-30</l></block><custom-block s="row A"></custom-block><block s="up"></block><block s="gotoXY"><l>150</l><l>-45</l></block><custom-block s="row B"></custom-block><block s="gotoXY"><l>150</l><l>-60</l></block><custom-block s="row A"></custom-block><block s="up"></block><block s="gotoXY"><l>150</l><l>-75</l></block><custom-block s="row B"></custom-block><block s="gotoXY"><l>150</l><l>-90</l></block><custom-block s="row A"></custom-block><block s="up"></block><block s="gotoXY"><l>150</l><l>-105</l></block><custom-block s="row B"></custom-block></script><script x="45" y="44"><custom-block s="draw wall with %n rows"><l>9</l></custom-block></script></scripts></sprite></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 != StageMorph.prototype.enableInheritance) {&#xD;            StageMorph.prototype.enableInheritance = tf;&#xD;            ide.currentSprite.blocksCache.variables = null;&#xD;            ide.currentSprite.paletteCache.variables = null;&#xD;            ide.refreshPalette();&#xD;        }&#xD;        break;&#xD;};&#xD;}&#xD;finally {&#xD;ide.savingPreferences = false;&#xD;};&#xD;</l></block><list><block var="which"/><block var="tf"/></list></block></script></block-definition><block-definition s="draw brick, length: %&apos;length&apos; width: 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