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<title> code for sub and sup script element
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<h1> HTML SUB and SUP elements </h1>
<p> we all need H<sub>2</sub> O. </p>
<p> E=mc <sup>2</sup> </p>
<p><b>(a+b)<sup>2</sup></b>= a<sup>2</sup>+b<sup>2</sup>+2ab</p>
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