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<!DOCTYPE html>
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<html>
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<head>
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<title>Escalator</title>
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<meta charset="utf-8" />
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<style>
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* { padding: 0; margin: 0; }
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canvas { display: block; margin: 0 auto; }
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</style>
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</head>
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<body>
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<canvas id="canvas"></canvas>
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<script src="js/escalator.js"></script>
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</body>
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</html>
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