<<< native
[ EArray
    [ AlignCenter
    , AlignCenter
    , AlignCenter
    , AlignCenter
    , AlignCenter
    ]
    [ [ []
      , []
      , [ EText TextNormal "symm" ]
      , [ EText TextNormal "stretch" ]
      , [ EText TextNormal "symm/stretch" ]
      ]
    , [ [ EText TextNormal "small op" ]
      , [ EGrouped [ ESymbol Op "\8747" , EIdentifier "x" ] ]
      , [ EGrouped [ ESymbol Op "\8747" , EIdentifier "x" ] ]
      , [ EDelimited "\8747" "" [ Right (EIdentifier "x") ] ]
      , [ EDelimited "\8747" "" [ Right (EIdentifier "x") ] ]
      ]
    , [ [ EText TextNormal "large op" ]
      , [ EGrouped [ ESymbol Op "\8747" , EIdentifier "x" ] ]
      , [ EGrouped [ ESymbol Op "\8747" , EIdentifier "x" ] ]
      , [ EDelimited "\8747" "" [ Right (EIdentifier "x") ] ]
      , [ EDelimited "\8747" "" [ Right (EIdentifier "x") ] ]
      ]
    , [ [ EText TextNormal "small op" ]
      , [ EGrouped
            [ ESymbol Op "\8747"
            , EFraction NormalFrac (EIdentifier "x") (EIdentifier "y")
            ]
        ]
      , [ EGrouped
            [ ESymbol Op "\8747"
            , EFraction NormalFrac (EIdentifier "x") (EIdentifier "y")
            ]
        ]
      , [ EDelimited
            "\8747"
            ""
            [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "y"))
            ]
        ]
      , [ EDelimited
            "\8747"
            ""
            [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "y"))
            ]
        ]
      ]
    , [ [ EText TextNormal "large op" ]
      , [ EGrouped
            [ ESymbol Op "\8747"
            , EFraction NormalFrac (EIdentifier "x") (EIdentifier "y")
            ]
        ]
      , [ EGrouped
            [ ESymbol Op "\8747"
            , EFraction NormalFrac (EIdentifier "x") (EIdentifier "y")
            ]
        ]
      , [ EDelimited
            "\8747"
            ""
            [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "y"))
            ]
        ]
      , [ EDelimited
            "\8747"
            ""
            [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "y"))
            ]
        ]
      ]
    ]
]
>>> eqn
matrix{
ccol{ {""} above {roman "small op"} above {roman "large op"} above {roman "small op"} above {roman "large op"} }
ccol{ {""} above {int x} above {int x} above {int x over y} above {int x over y} }
ccol{ {roman "symm"} above {int x} above {int x} above {int x over y} above {int x over y} }
ccol{ {roman "stretch"} above {left ∫ x right ""} above {left ∫ x right ""} above {left ∫ x over y right ""} above {left ∫ x over y right ""} }
ccol{ {roman "symm/stretch"} above {left ∫ x right ""} above {left ∫ x right ""} above {left ∫ x over y right ""} above {left ∫ x over y right ""} }
}