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<h1>블록 구조1</h1>
<div>블록 구조2</div>
<p>블록 구조3</p>
<ul>
  <li>블록 구조4</li>
</ul>
<ol>
  <li>블록 구조5</li>
</ol>

<span>인라인 구조1</span>
<em>인라인 구조2</em>
<strong>인라인 구조3</strong>

h1, div, p, ul, ol {
  border: 1px solid #000
}

span, em, strong {
  border: 1px solid #000;
}

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