<?xml version="1.0" encoding="UTF-8"?>

<math xmlns="http://www.w3.org/1998/Math/MathML">
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    <mi>A</mi> 
    <mstyle scriptlevel="2">
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        <mi>A</mi> 
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    </mstyle> 
    <mi>A</mi> 
    <mstyle fontweight="bold">
      <mphantom>
        <mi>A</mi> 
        <mo>+</mo> 
        <mi>A</mi> 
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      <mi>A</mi> 
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  </mstyle> 
  <mi>A</mi> 
  <mstyle scriptlevel="2">
    <mi>A</mi> 
  </mstyle> 
  <mi>A</mi> 
  <mstyle fontweight="bold">
    <mi>A</mi> 
    <mo>+</mo> 
    <mi>A</mi> 
    <mi>A</mi> 
  </mstyle> </math>