<snapdata remixID="8923538"><project name="U2L4-checkerboard_SV" app="Snap! 5.1, http://snap.berkeley.edu" version="1"><notes></notes><thumbnail>data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAE4klEQVR4Xu3cPWgUURSG4bOFwaQUrEQUO63ExkJBrZNasRFFLQTtRBGEGBQCWmppZSGIbUAQLCJoFSRYaBHQ2NgoglV+mpFR2J1sXLM572ZmMa+l5Jtz99xn7l0yN9MqiqII/9mBhjrQEmBDnbfs7w4IUAiNdkCAjbbf4gLUQKMdEGCj7be4ADXQaAcE2Gj7LS5ADTTaAQE22n6LC1ADjXZAgI223+IC1ECjHRgOgIf3p5ow+uHLpnNLh/ZtOpOpUxapq1amTjm+zOdaWh3s2RUB9sExM1EC7KOxQ3MYwRWwPVsZ7K6A/WHv/VMCFCA1hPICFCACRMMCFCA1hPICFCACRMMCFCA1hPICFCACRMMCFCA1hPICFCACRMMCFCA1hPICFCACRMMCFCA1RPKjI61UPPMMdOiftQ75aZ2YX0zNVa/QUJyGEWBneuq6qcqKmVoCrNxKmQa6AjLsAhTgut0sc1O5Alba6BbMViUBwq+lAhQgJMTiAhQgEwTTAhQgJMTiAhQgEwTTAhQgJMTiAhQgEwTTAhQgJMTiAhQgE0TTnoZpdzDzS+XMI8myYKqWr+boaE81cMhPm9T1mQRYXTVdAV0B6S6K8gIUIAJEwwIUIDWE8gIUIAJEwwIUIDWE8gIUIAJEwwIUIDWE8gIUIAJEwwIUIDWE8gIUIAJEwwIUIDVE8p6G6XQvc7Ag8/y4rJip5d8FV6RnGpiZrEydcph11crUEWAFkiugKyDZQXFWgALEiMgFBChA4gdnBShAjIhcQIACJH5wVoACxIjIBQQoQOIHZwUoQIyIXECAAiR+cFaAAsSIyAUEKEDiB2cFKECMCF3A41jt9mUOFtR6WMJXc3So1zVZmTrlKDMwMrUydcrxpWoJUIDdu40A0f4bEW7BbsHUEMoLUIAIEA0LUIDUEMoLUIAIEA0LUIDUEMoLUIAIEA0LUIDUEMoLUIAIEA0LUIDUEMoLUIAIEAx7GqbTwMxjtcwz3bJippav5qhgzzQwM1mZOuUw66qVqSPACiRXQFdAuImyuAAFyATBtAAFCAmxuAAFyATBtAAFCAmxuAAFyATBtAAFCAmxuAAFyATBtAAFCAmxuAAFyATBtAAFCAnBuKdh2g3MPNet9Vm1f5jewV7XZGXqlKPMwMjUytQpx5eqJUABdu83AoQ7sG9GqP+mcgWsovU7oN8B6SKG8gIUIAJEwwIUIDWE8gIUIAJEwwIUIDWE8gIUIAJEwwIUIDWE8gIUIAJEwwIUIDWE8gIUIAIEwx7H6jQw81w3c6igrJip5as5KtgzDcxMVqZOOcy6amXqCLACyRXQFRBuoiwuwOYBztx9GBML7yOePI6IoveEzi+yye5Kt4qi+Ee1gdbqeTEBNg8w3n2KOHIglneMxJ2x3TH94mW0rl+JePt67bwJsP7J2i7fAWfuPYqJ21fXgFsYGYunJ8dj8vy5iGsXIl7NDXRVcgXso53bBWDs2Rsfv32Pg6tLf+3KjZ+rcf/z1z461v+PCLCPXm0XgLd+LMf0rp3tjjxfKaKYehCndxQRUzf//L9bsFtw9z0ziF/DTB4fj7Nzs/Hs6KmYvHwp4uKZiJXl9benAAW4FQDj2ImIN7Mb7wcCFOCWANyYnltwd48y380y21WmTjnWumpl6pTjS30uV0BXwP9pBfwFEJCAAibVuoQAAAAASUVORK5CYII=</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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!= 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;        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