<<< native
[ EArray
    [ AlignCenter , AlignCenter , AlignCenter ]
    [ [ []
      , [ EText TextNormal "Stetching in base" ]
      , [ EText TextNormal "Stretching in script" ]
      ]
    , [ [ EText TextNormal "no mrows" ]
      , [ EOver
            False (ESymbol Accent "\8594") (EText TextNormal "maps to")
        ]
      , [ EOver
            False (EText TextNormal "maps to") (ESymbol Accent "\8594")
        ]
      ]
    , [ [ EText TextNormal "all in row" ]
      , [ EOver
            False (ESymbol Accent "\8594") (EText TextNormal "maps to")
        ]
      , [ EOver
            False (EText TextNormal "maps to") (ESymbol Accent "\8594")
        ]
      ]
    , [ [ EText TextNormal "op in row" ]
      , [ EOver
            False (ESymbol Accent "\8594") (EText TextNormal "maps to")
        ]
      , [ EOver
            False (EText TextNormal "maps to") (ESymbol Accent "\8594")
        ]
      ]
    , [ [ EText TextNormal "text in row" ]
      , [ EOver
            False (ESymbol Accent "\8594") (EText TextNormal "maps to")
        ]
      , [ EOver
            False (EText TextNormal "maps to") (ESymbol Accent "\8594")
        ]
      ]
    ]
]
>>> omml
<?xml version='1.0' ?>
<m:oMathPara>
  <m:oMathParaPr>
    <m:jc m:val="center" />
  </m:oMathParaPr>
  <m:oMath>
    <m:m>
      <m:mPr>
        <m:baseJc m:val="center" />
        <m:plcHide m:val="1" />
        <m:mcs>
          <m:mc>
            <m:mcPr>
              <m:mcJc m:val="center" />
              <m:count m:val="1" />
            </m:mcPr>
          </m:mc>
          <m:mc>
            <m:mcPr>
              <m:mcJc m:val="center" />
              <m:count m:val="1" />
            </m:mcPr>
          </m:mc>
          <m:mc>
            <m:mcPr>
              <m:mcJc m:val="center" />
              <m:count m:val="1" />
            </m:mcPr>
          </m:mc>
        </m:mcs>
      </m:mPr>
      <m:mr>
        <m:e />
        <m:e>
          <m:r>
            <m:rPr>
              <m:nor />
              <m:sty m:val="p" />
            </m:rPr>
            <m:t>Stetching in base</m:t>
          </m:r>
        </m:e>
        <m:e>
          <m:r>
            <m:rPr>
              <m:nor />
              <m:sty m:val="p" />
            </m:rPr>
            <m:t>Stretching in script</m:t>
          </m:r>
        </m:e>
      </m:mr>
      <m:mr>
        <m:e>
          <m:r>
            <m:rPr>
              <m:nor />
              <m:sty m:val="p" />
            </m:rPr>
            <m:t>no mrows</m:t>
          </m:r>
        </m:e>
        <m:e>
          <m:limUpp>
            <m:e>
              <m:r>
                <m:rPr>
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>→</m:t>
              </m:r>
            </m:e>
            <m:lim>
              <m:r>
                <m:rPr>
                  <m:nor />
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>maps to</m:t>
              </m:r>
            </m:lim>
          </m:limUpp>
        </m:e>
        <m:e>
          <m:acc>
            <m:accPr>
              <m:chr m:val="→" />
            </m:accPr>
            <m:e>
              <m:r>
                <m:rPr>
                  <m:nor />
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>maps to</m:t>
              </m:r>
            </m:e>
          </m:acc>
        </m:e>
      </m:mr>
      <m:mr>
        <m:e>
          <m:r>
            <m:rPr>
              <m:nor />
              <m:sty m:val="p" />
            </m:rPr>
            <m:t>all in row</m:t>
          </m:r>
        </m:e>
        <m:e>
          <m:limUpp>
            <m:e>
              <m:r>
                <m:rPr>
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>→</m:t>
              </m:r>
            </m:e>
            <m:lim>
              <m:r>
                <m:rPr>
                  <m:nor />
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>maps to</m:t>
              </m:r>
            </m:lim>
          </m:limUpp>
        </m:e>
        <m:e>
          <m:acc>
            <m:accPr>
              <m:chr m:val="→" />
            </m:accPr>
            <m:e>
              <m:r>
                <m:rPr>
                  <m:nor />
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>maps to</m:t>
              </m:r>
            </m:e>
          </m:acc>
        </m:e>
      </m:mr>
      <m:mr>
        <m:e>
          <m:r>
            <m:rPr>
              <m:nor />
              <m:sty m:val="p" />
            </m:rPr>
            <m:t>op in row</m:t>
          </m:r>
        </m:e>
        <m:e>
          <m:limUpp>
            <m:e>
              <m:r>
                <m:rPr>
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>→</m:t>
              </m:r>
            </m:e>
            <m:lim>
              <m:r>
                <m:rPr>
                  <m:nor />
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>maps to</m:t>
              </m:r>
            </m:lim>
          </m:limUpp>
        </m:e>
        <m:e>
          <m:acc>
            <m:accPr>
              <m:chr m:val="→" />
            </m:accPr>
            <m:e>
              <m:r>
                <m:rPr>
                  <m:nor />
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>maps to</m:t>
              </m:r>
            </m:e>
          </m:acc>
        </m:e>
      </m:mr>
      <m:mr>
        <m:e>
          <m:r>
            <m:rPr>
              <m:nor />
              <m:sty m:val="p" />
            </m:rPr>
            <m:t>text in row</m:t>
          </m:r>
        </m:e>
        <m:e>
          <m:limUpp>
            <m:e>
              <m:r>
                <m:rPr>
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>→</m:t>
              </m:r>
            </m:e>
            <m:lim>
              <m:r>
                <m:rPr>
                  <m:nor />
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>maps to</m:t>
              </m:r>
            </m:lim>
          </m:limUpp>
        </m:e>
        <m:e>
          <m:acc>
            <m:accPr>
              <m:chr m:val="→" />
            </m:accPr>
            <m:e>
              <m:r>
                <m:rPr>
                  <m:nor />
                  <m:sty m:val="p" />
                </m:rPr>
                <m:t>maps to</m:t>
              </m:r>
            </m:e>
          </m:acc>
        </m:e>
      </m:mr>
    </m:m>
  </m:oMath>
</m:oMathPara>