<!DOCTYPE html>
<html>
<head>
  <title>op-dict symmetric</title>
  <link rel="mismatch" href="op-dict-3-notref.html">
</head>
<body>
  <math>
    <mrow>
      <mo symmetric="false">(</mo>
      <mspace height="5em" depth="5em"/>
    </mrow>
  </math>
</body>
</html>
