<<< native
[ EUnderover
    False (ESymbol Op "\8721") (EIdentifier "x") (ENumber "0")
, ESymbol Rel "="
, EUnderover
    False (ESymbol Op "\8721") (EIdentifier "x") (ENumber "0")
, ESymbol Rel "="
, EUnderover
    False (ESymbol Op "\8721") (EIdentifier "x") (ENumber "0")
, ESymbol Rel "="
, EGrouped
    [ EUnderover
        False (ESymbol Op "\8721") (EIdentifier "x") (ENumber "0")
    , ESymbol Rel "="
    , EUnderover
        False (ESymbol Op "\8721") (EIdentifier "x") (ENumber "0")
    , ESymbol Rel "="
    , EUnderover
        False (ESymbol Op "\8721") (EIdentifier "x") (ENumber "0")
    ]
]
>>> omml
<?xml version='1.0' ?>
<m:oMathPara>
  <m:oMathParaPr>
    <m:jc m:val="center" />
  </m:oMathParaPr>
  <m:oMath>
    <m:nary>
      <m:naryPr>
        <m:chr m:val="∑" />
        <m:limLoc m:val="undOvr" />
        <m:subHide m:val="0" />
        <m:supHide m:val="0" />
      </m:naryPr>
      <m:sub>
        <m:r>
          <m:t>x</m:t>
        </m:r>
      </m:sub>
      <m:sup>
        <m:r>
          <m:t>0</m:t>
        </m:r>
      </m:sup>
      <m:e>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>=</m:t>
        </m:r>
      </m:e>
    </m:nary>
    <m:nary>
      <m:naryPr>
        <m:chr m:val="∑" />
        <m:limLoc m:val="undOvr" />
        <m:subHide m:val="0" />
        <m:supHide m:val="0" />
      </m:naryPr>
      <m:sub>
        <m:r>
          <m:t>x</m:t>
        </m:r>
      </m:sub>
      <m:sup>
        <m:r>
          <m:t>0</m:t>
        </m:r>
      </m:sup>
      <m:e>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>=</m:t>
        </m:r>
      </m:e>
    </m:nary>
    <m:nary>
      <m:naryPr>
        <m:chr m:val="∑" />
        <m:limLoc m:val="undOvr" />
        <m:subHide m:val="0" />
        <m:supHide m:val="0" />
      </m:naryPr>
      <m:sub>
        <m:r>
          <m:t>x</m:t>
        </m:r>
      </m:sub>
      <m:sup>
        <m:r>
          <m:t>0</m:t>
        </m:r>
      </m:sup>
      <m:e>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>=</m:t>
        </m:r>
      </m:e>
    </m:nary>
    <m:nary>
      <m:naryPr>
        <m:chr m:val="∑" />
        <m:limLoc m:val="undOvr" />
        <m:subHide m:val="0" />
        <m:supHide m:val="0" />
      </m:naryPr>
      <m:sub>
        <m:r>
          <m:t>x</m:t>
        </m:r>
      </m:sub>
      <m:sup>
        <m:r>
          <m:t>0</m:t>
        </m:r>
      </m:sup>
      <m:e>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>=</m:t>
        </m:r>
      </m:e>
    </m:nary>
    <m:nary>
      <m:naryPr>
        <m:chr m:val="∑" />
        <m:limLoc m:val="undOvr" />
        <m:subHide m:val="0" />
        <m:supHide m:val="0" />
      </m:naryPr>
      <m:sub>
        <m:r>
          <m:t>x</m:t>
        </m:r>
      </m:sub>
      <m:sup>
        <m:r>
          <m:t>0</m:t>
        </m:r>
      </m:sup>
      <m:e>
        <m:r>
          <m:rPr>
            <m:sty m:val="p" />
          </m:rPr>
          <m:t>=</m:t>
        </m:r>
      </m:e>
    </m:nary>
    <m:nary>
      <m:naryPr>
        <m:chr m:val="∑" />
        <m:limLoc m:val="undOvr" />
        <m:subHide m:val="0" />
        <m:supHide m:val="0" />
      </m:naryPr>
      <m:sub>
        <m:r>
          <m:t>x</m:t>
        </m:r>
      </m:sub>
      <m:sup>
        <m:r>
          <m:t>0</m:t>
        </m:r>
      </m:sup>
      <m:e>
        <m:r>
          <m:t>&#8203;</m:t>
        </m:r>
      </m:e>
    </m:nary>
  </m:oMath>
</m:oMathPara>