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<h1 style="background-color:hsl(0, 100%, 50%);">tiêu đề 1</h1>
<h1 style="background-color:hsl(240, 100%, 50%);">tiêu đề 2</h1>
<h1 style="background-color:hsl(147, 50%, 47%);">tiêu đề 3</h1>
<h1 style="background-color:hsl(300, 76%, 72%);">tiêu đề 4</h1>
<h1 style="background-color:hsl(39, 100%, 50%);">tiêu đề 5</h1>
<h1 style="background-color:hsl(248, 53%, 58%);">tiêu đề 6</h1>

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