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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\0339"}</style>
</head>
<body>
  <h1>Right Half Ring Below (U+0339) in HTML</h1>
  <p>Hex: a&#x0339; e&#x0339;</p>
  <p>Decimal: a&#825; o&#825;</p>
  <p id=point>CSS: a</p>
</body>
</html>

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HTML Entity for Right Half Ring Below (U+0339)