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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\2284"}</style>
</head>
<body>
  <h1>Not Subset Of (⊄) in HTML</h1>
  <p>Using Hex Code: &#x2284;</p>
  <p>Using Decimal: &#8836;</p>
  <p>Using Named Entity: &nsub;</p>
  <p id=point>Using CSS Entity: </p>
  <p>Example: {1, 3} ⊄ {1, 2}</p>
</body>
</html>

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HTML Entity for Not Subset Of (⊄)