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<p>Valid nesting:</p>

<p><strong><a href="url">Link</a></strong></p>

<p><a href="url"><strong>Link</strong></a></p>

<p><strong><a href="url"><strong>Link</strong></a></strong></p>

<p>Invalid nesting:</p>

<p><a href="url">[Link](url)</a></p>