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<!DOCTYPE html>
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<html>
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<head></head>
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<body>
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<form>
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<label for="username">Username</label>
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<input id="username" type="text" />
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<input type="submit" value="Submit" />
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</form>
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<script type="text/javascript">
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var x = document.forms[0].length;
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document.write(x);
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</script>
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</body>
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</html>
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