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<!DOCTYPE html>
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<html>
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<link rel='stylesheet' type='text/css' href='style.css'>
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<body>
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<input class='notinvalid' id='i' type='radio' checked required>
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<input class='notinvalid' type='radio'> <!-- adding this one so we don't have to create a second ref -->
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</body>
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</html>
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