<<< native
[ EArray
    [ AlignCenter , AlignCenter , AlignCenter , AlignCenter ]
    [ [ [ EIdentifier "B" ] , [ EIdentifier "C" ] , [] , [] ]
    , [ [] , [] , [] , [] ]
    , [ [ ENumber "1" ]
      , [ ENumber "2" ]
      , [ ENumber "3" ]
      , [ ENumber "4" ]
      ]
    ]
]
>>> 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: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:r>
            <m:t>B</m:t>
          </m:r>
        </m:e>
        <m:e>
          <m:r>
            <m:t>C</m:t>
          </m:r>
        </m:e>
        <m:e />
        <m:e />
      </m:mr>
      <m:mr>
        <m:e />
        <m:e />
        <m:e />
        <m:e />
      </m:mr>
      <m:mr>
        <m:e>
          <m:r>
            <m:t>1</m:t>
          </m:r>
        </m:e>
        <m:e>
          <m:r>
            <m:t>2</m:t>
          </m:r>
        </m:e>
        <m:e>
          <m:r>
            <m:t>3</m:t>
          </m:r>
        </m:e>
        <m:e>
          <m:r>
            <m:t>4</m:t>
          </m:r>
        </m:e>
      </m:mr>
    </m:m>
  </m:oMath>
</m:oMathPara>