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<html><body> <p><b>This is bold text</b></p> <p><strong>This is strong and important</strong></p> <p><i>This is italic text</i></p> <p><em>This is emphasized</em></p> <p><u>This is underlined</u></p> <p>This is <mark>highlighted text</mark>.</p> <p>This is <small>small print</small>.</p> <p>This is <del>deleted</del> and <ins>inserted</ins>.</p> <p>Water formula: H<sub>2</sub>O</p> <p>Math: x<sup>2</sup> + y<sup>2</sup></p> </body></html>