munderover-accentunder-dynamic-001-ref.html

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 <html>

   <head>

     <title>munderover@accentunder</title>

     <meta charset="utf-8"/>

   </head>

   <body>

    <math>

      <munderover accentunder="true"><mtext>X</mtext><mo>O</mo><mo>O</mo></munderover>

    </math>

   </body>

</html>