Answer:
DOCTYPE html>
<html>
<body>
<h1> a^3-b^3 </h1>
<h2> a^3-b^3 </h2>
<h3> a^3-b^3 </h3>
<h4> a^3-b^3 </h4>
<h5> a^3-b^3 </h5>
<h6> a^3-b^3 </h6>
</body>
</html>
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