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<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:500px; height:100px;
border:solid 5px #000;
border-color:#000 transparent transparent transparent;
border-radius: 50%/100px 100px 0 0;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
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