msubsup issue

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The Msubsup issue

Msubsup are broken up in the semantic tree into explicit subscripts and superscripts if advisable.

Original MathML:

<math>
  <msubsup>
    <mi>a</mi>
    <mi>b</mi>
    <mi>c</mi>
  </msubsup>
</math>

Semantic Tree:

<stree>
  <superscript role="latinletter" id="4">
    <children>
      <subscript role="subsup" id="3">
        <children>
          <identifier role="latinletter" font="italic" id="0">a</identifier>
          <identifier role="latinletter" font="italic" id="1">b</identifier>
        </children>
      </subscript>
      <identifier role="latinletter" font="italic" id="2">c</identifier>
    </children>
  </superscript>
</stree>