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      <mi id="p1.1.m1.1.1" xref="p1.1.m1.1.1.cmml">N</mi>
      <mn id="p1.1.m1.1.2.1" xref="p1.1.m1.1.2.1.cmml">2</mn>
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<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="{\displaystyle N^{2}}">
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          <mi>N</mi>
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    <annotation encoding="application/x-tex">{\displaystyle N^{2}}</annotation>
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