1 <p>this is <strong>strong</strong> and this is <strong>strong</strong>.</p>
2 <p>this is <em>em</em> and this is <em>em</em>.</p>
3 <p><em><code>code</code></em> <strong><code>code</code></strong></p>
4 <p><em><code>code</code><strong><code>code</code></strong><code>code</code></em></p>