<<< native
[ EArray
    [ AlignLeft , AlignLeft , AlignLeft ]
    [ [ [ ENumber "1" ]
      , [ EGrouped
            [ EIdentifier "x" , ESymbol Bin "+" , EIdentifier "y" ]
        ]
      , [ EGrouped
            [ ESuper (EIdentifier "x") (ENumber "2")
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "2"
                , ESymbol Ord "\8290"
                , EIdentifier "y"
                , ESymbol Ord "\8290"
                , EIdentifier "x"
                ]
            , ESymbol Bin "+"
            , ESuper (EIdentifier "y") (ENumber "2")
            ]
        ]
      ]
    , [ [ EGrouped
            [ EIdentifier "x" , ESymbol Bin "+" , EIdentifier "y" ]
        ]
      , [ EGrouped
            [ ESuper (EIdentifier "x") (ENumber "2")
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "2"
                , ESymbol Ord "\8290"
                , EIdentifier "y"
                , ESymbol Ord "\8290"
                , EIdentifier "x"
                ]
            , ESymbol Bin "+"
            , ESuper (EIdentifier "y") (ENumber "2")
            ]
        ]
      , [ EGrouped
            [ ESuper (EIdentifier "x") (ENumber "3")
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "3"
                , ESymbol Ord "\8290"
                , EIdentifier "y"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "2")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "3"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "2")
                , ESymbol Ord "\8290"
                , EIdentifier "x"
                ]
            , ESymbol Bin "+"
            , ESuper (EIdentifier "y") (ENumber "3")
            ]
        ]
      ]
    , [ [ EGrouped
            [ ESuper (EIdentifier "x") (ENumber "2")
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "2"
                , ESymbol Ord "\8290"
                , EIdentifier "y"
                , ESymbol Ord "\8290"
                , EIdentifier "x"
                ]
            , ESymbol Bin "+"
            , ESuper (EIdentifier "y") (ENumber "2")
            ]
        ]
      , [ EGrouped
            [ ESuper (EIdentifier "x") (ENumber "3")
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "3"
                , ESymbol Ord "\8290"
                , EIdentifier "y"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "2")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "3"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "2")
                , ESymbol Ord "\8290"
                , EIdentifier "x"
                ]
            , ESymbol Bin "+"
            , ESuper (EIdentifier "y") (ENumber "3")
            ]
        ]
      , [ EGrouped
            [ ESuper (EIdentifier "x") (ENumber "4")
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "4"
                , ESymbol Ord "\8290"
                , EIdentifier "y"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "3")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "6"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "2")
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "2")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "4"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "3")
                , ESymbol Ord "\8290"
                , EIdentifier "x"
                ]
            , ESymbol Bin "+"
            , ESuper (EIdentifier "y") (ENumber "4")
            ]
        ]
      ]
    , [ [ EGrouped
            [ ESuper (EIdentifier "x") (ENumber "3")
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "3"
                , ESymbol Ord "\8290"
                , EIdentifier "y"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "2")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "3"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "2")
                , ESymbol Ord "\8290"
                , EIdentifier "x"
                ]
            , ESymbol Bin "+"
            , ESuper (EIdentifier "y") (ENumber "3")
            ]
        ]
      , [ EGrouped
            [ ESuper (EIdentifier "x") (ENumber "4")
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "4"
                , ESymbol Ord "\8290"
                , EIdentifier "y"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "3")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "6"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "2")
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "2")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "4"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "3")
                , ESymbol Ord "\8290"
                , EIdentifier "x"
                ]
            , ESymbol Bin "+"
            , ESuper (EIdentifier "y") (ENumber "4")
            ]
        ]
      , [ EGrouped
            [ ESuper (EIdentifier "x") (ENumber "5")
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "5"
                , ESymbol Ord "\8290"
                , EIdentifier "y"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "4")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "10"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "2")
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "3")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "10"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "3")
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "x") (ENumber "2")
                ]
            , ESymbol Bin "+"
            , EGrouped
                [ ENumber "5"
                , ESymbol Ord "\8290"
                , ESuper (EIdentifier "y") (ENumber "4")
                , ESymbol Ord "\8290"
                , EIdentifier "x"
                ]
            , ESymbol Bin "+"
            , ESuper (EIdentifier "y") (ENumber "5")
            ]
        ]
      ]
    ]
]
>>> eqn
matrix{
lcol{ 1 above {x + y} above {x sup 2 + {2  y  x} + y sup 2} above {x sup 3 + {3  y  x sup 2} + {3  y sup 2  x} + y sup 3} }
lcol{ {x + y} above {x sup 2 + {2  y  x} + y sup 2} above {x sup 3 + {3  y  x sup 2} + {3  y sup 2  x} + y sup 3} above {x sup 4 + {4  y  x sup 3} + {6  y sup 2  x sup 2} + {4  y sup 3  x} + y sup 4} }
lcol{ {x sup 2 + {2  y  x} + y sup 2} above {x sup 3 + {3  y  x sup 2} + {3  y sup 2  x} + y sup 3} above {x sup 4 + {4  y  x sup 3} + {6  y sup 2  x sup 2} + {4  y sup 3  x} + y sup 4} above {x sup 5 + {5  y  x sup 4} + {10  y sup 2  x sup 3} + {10  y sup 3  x sup 2} + {5  y sup 4  x} + y sup 5} }
}