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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
  <mml:mstyle mathsize="1em" displaystyle="true" mathcolor="#0000ff" f
+ontfamily="serif">
...
    <mml:mi>s</mml:mi>
  </mml:mstyle>
</mml:math>

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```
<mml:mi>s</mml:mi>
```