<!-- Example 1 -->
<ol>
  <li>Item 1</li>
  <li>Item 2</li>
  <li>Item 3</li>
</ol>

<!-- Example 2 -->
<p>The <code>h1</code> element is used to create headings in HTML.</p>

<!-- Example 3 -->
<ol>
  <li>Item 1</li>
  <li>Item 2
    <ul>
      <li>Subitem 1</li>
      <li>Subitem 2</li>
    </ul>
  </li>
  <li>Item 3</li>
</ol>

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