60 lines
276 B
HTML
60 lines
276 B
HTML
<!-- Scroll 👇 to check the solution -->
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<h1>Book</h1>
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<h2>Chapter 1</h2>
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<h3>Section 1</h3>
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<h3>Section 2</h3>
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<h2>Chapter 2</h2>
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<h3>Section 1</h3>
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<h4>Diagram 1</h4>
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<h2>Chapter 3</h2>
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<h3>Section 1</h3>
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<h3>Section 2</h3> |