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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title><mo> dynamic form</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
math, math * {
font: 60px/1 Ahem;
}
mo {
color: blue;
}
</style>
</head>
<body>
<p>
<math>
<mn>1</mn><mo id="infix_attach_prefix" form="prefix">+</mo><mn>2</mn>
</math>
</p>
<p>
<math>
<mo id="prefix_attach_infix" form="infix">+</mo><mn>3</mn>
</math>
</p>
<p>
<math>
<mn>1</mn><mo id="infix_remove">+</mo><mn>2</mn>
</math>
</p>
<p>
<math>
<mo id="prefix_remove">+</mo><mn>3</mn>
</math>
</p>
<p>
<math>
<mn>1</mn><mo id="infix_set_to_prefix" form="prefix">+</mo><mn>2</mn>
</math>
</p>
<p>
<math>
<mo id="prefix_set_to_infix" form="infix">+</mo><mn>3</mn>
</math>
</p>
</body>
</html>
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