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<html xmlns="http://www.w3.org/1999/xhtml" xmlns:m="http://www.w3.org/1998/Math/MathML">
<head>
<style type="text/css">
#q { width: 16px; height: 16px; }
#a, #b { counter-increment: chicken; }
</style>
<style id="s" type="text/css">
#a { content: 'x'; }
</style>
<script type="text/javascript">
function boom()
{
remove(document.getElementById("s"));
remove(document.getElementById("b"));
}
function remove(n)
{
n.parentNode.removeChild(n);
}
</script>
</head>
<body onload="boom();">
<m:mrow id="a"/><m:mo id="q"><m:malignmark><m:msubsup/><m:munderover/><m:munder id="b"/></m:malignmark></m:mo>
</body>
</html>
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