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<html>
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<head>
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<title>Archimedean spiral</title>
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<style>h3 {font-family:sans-serif; color:gray;}</style>
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</head>
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<body onload="main('red')(15)">
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<h3>Archimedean spiral</h3></p>
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<canvas id="spiral" width="640" height="640" style="border: 2px outset;"></canvas>
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<script>
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