sub and sup

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Sun Jul 25 2021 09:07:56 GMT+0000 (UTC)

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 <h3>This page shows subscript and superscript text</h3>
    <p>x<sup>2</sup>+ y<sup>2</sup> = 1</u></p>
    <p>2h<sub>2</sub>+ O<sub>2</sub> = 2h<sub>2</sub>O</p>
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