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<!DOCTYPE html>
<body>
<section>
<div>1</div>
<span>2</span>
<div class="before">3</div>
</section>
<section>
<span>2</span>
<div class="before">3</div>
<div>4</div>
</section>
<section style="columns: 1">
<div>1</div>
<span>2</span>
<div class="before">3</div>
</section>
</body>