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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/xhtml-math11-f.dtd" >
<head>
</head>
<body>
<p>
<msub>
<mi>x</mi>
<mn>2</mn>
</msub>
</math>
</p>
</body>
</html>