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<!DOCTYPE html>
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<html>
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<head>
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<title>Html5</title>
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<meta charset="UTF-8">
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</head>
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<body>
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(a + b)<sup>2</sup> = a<sup>2</sup> + 2ab + b<sup>2</sup><br>
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H<sub>2</sub>O
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</body>
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</html> |