 \ 

[images/example7.png] Screenshot

---
<?xml version="1.0"?>
<!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/TR/MathML2/dtd/mathml2.dtd">
<math mode="display">
  <msubsup>
    <mi>x</mi>
    <msubsup>
      <mi>y</mi>
      <mi>b</mi>
      <mi>a</mi>
    </msubsup>
    <msubsup>
      <mi>z</mi>
      <mi>c</mi>
      <mi>d</mi>
    </msubsup>
  </msubsup>
</math>
---
