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<article class="block">아티클이에요</article>
<div class="block">디브에요
  <div>자식 디브에요</div>
</div>
<section class="block">섹션이에요
  <span>스팬이에요</span>
</section>

.block{
  width:100px;
  hwight:50px;
  margin:10px;
  background-color: aqua;
}

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