<<< native
[ EArray
    [ AlignCenter , AlignCenter , AlignCenter , AlignCenter ]
    [ [ [ EIdentifier "B" ] , [ EIdentifier "C" ] , [] , [] ]
    , [ [] , [] , [] , [] ]
    , [ [ ENumber "1" ]
      , [ ENumber "2" ]
      , [ ENumber "3" ]
      , [ ENumber "4" ]
      ]
    ]
]
>>> eqn
matrix{
ccol{ B above {""} above 1 }
ccol{ C above {""} above 2 }
ccol{ {""} above {""} above 3 }
ccol{ {""} above {""} above 4 }
}