munderover-11.test

<<< native
[ EUnderover
    False (EIdentifier "BASE") (EIdentifier "s") (EIdentifier "t")
, ESymbol Rel "="
, EUnderover
    False
    (EIdentifier "BASE")
    (EGrouped
       [ EPhantom (ENumber "1")
       , EIdentifier "s"
       , EPhantom (ENumber "1")
       ])
    (EGrouped
       [ EPhantom (ENumber "1")
       , EIdentifier "t"
       , EPhantom (ENumber "1")
       ])
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <munderover>
      <mi>BASE</mi>
      <mi>s</mi>
      <mi>t</mi>
    </munderover>
    <mo>=</mo>
    <munderover>
      <mi>BASE</mi>
      <mrow>
        <mphantom>
          <mn>1</mn>
        </mphantom>
        <mi>s</mi>
        <mphantom>
          <mn>1</mn>
        </mphantom>
      </mrow>
      <mrow>
        <mphantom>
          <mn>1</mn>
        </mphantom>
        <mi>t</mi>
        <mphantom>
          <mn>1</mn>
        </mphantom>
      </mrow>
    </munderover>
  </mrow>
</math>