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Program 1
<html>
<body>
<p><b><u><i>This is some text</i></u></b></p>
<p>H<sub>2</sub>O</p>
<p>a<sup>3</sup></p>
<p><small>this is some text</small></p>
<p><big>this is some text</big></p>
</body>
</html>