<<< native
[ EArray
    [ AlignCenter , AlignCenter ]
    [ [ [ EText TextNormal "single integral" ]
      , [ EGrouped
            [ EGrouped [ ESymbol Op "\8747" , EIdentifier "x" ]
            , EGrouped [ ESymbol Op "\8747" , EIdentifier "M" ]
            , EDelimited
                "\8747"
                ""
                [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "o"))
                ]
            , EDelimited
                "\8747"
                ""
                [ Right (EFraction NormalFrac (EIdentifier "A") (EIdentifier "o"))
                ]
            , EDelimited
                "\8747"
                ""
                [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "A"))
                ]
            , EDelimited
                "\8747"
                ""
                [ Right (EFraction NormalFrac (EIdentifier "A") (EIdentifier "M"))
                ]
            , EDelimited
                "\8747"
                ""
                [ Right (EFraction NormalFrac (EIdentifier ".") (EIdentifier "''"))
                ]
            ]
        ]
      ]
    , [ [ EText TextNormal "double integral" ]
      , [ EGrouped
            [ EDelimited
                "\8747"
                ""
                [ Right (EDelimited "\8747" "" [ Right (EIdentifier "x") ]) ]
            , EDelimited
                "\8747"
                ""
                [ Right (EDelimited "\8747" "" [ Right (EIdentifier "M") ]) ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "o"))
                       ])
                ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier "A") (EIdentifier "o"))
                       ])
                ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "A"))
                       ])
                ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier "A") (EIdentifier "M"))
                       ])
                ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier ".") (EIdentifier "''"))
                       ])
                ]
            ]
        ]
      ]
    , [ [ EText TextNormal "double nested integral" ]
      , [ EGrouped
            [ EDelimited
                "\8747"
                ""
                [ Right (EDelimited "\8747" "" [ Right (EIdentifier "x") ]) ]
            , EDelimited
                "\8747"
                ""
                [ Right (EDelimited "\8747" "" [ Right (EIdentifier "M") ]) ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "o"))
                       ])
                ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier "A") (EIdentifier "o"))
                       ])
                ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier "x") (EIdentifier "A"))
                       ])
                ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier "A") (EIdentifier "M"))
                       ])
                ]
            , EDelimited
                "\8747"
                ""
                [ Right
                    (EDelimited
                       "\8747"
                       ""
                       [ Right (EFraction NormalFrac (EIdentifier ".") (EIdentifier "''"))
                       ])
                ]
            ]
        ]
      ]
    ]
]
>>> eqn
matrix{
ccol{ {roman "single integral"} above {roman "double integral"} above {roman "double nested integral"} }
ccol{ {{int x} {int M} left ∫ x over o right "" left ∫ A over o right "" left ∫ x over A right "" left ∫ A over M right "" left ∫ . over '' right ""} above {left ∫ left ∫ x right "" right "" left ∫ left ∫ M right "" right "" left ∫ left ∫ x over o right "" right "" left ∫ left ∫ A over o right "" right "" left ∫ left ∫ x over A right "" right "" left ∫ left ∫ A over M right "" right "" left ∫ left ∫ . over '' right "" right ""} above {left ∫ left ∫ x right "" right "" left ∫ left ∫ M right "" right "" left ∫ left ∫ x over o right "" right "" left ∫ left ∫ A over o right "" right "" left ∫ left ∫ x over A right "" right "" left ∫ left ∫ A over M right "" right "" left ∫ left ∫ . over '' right "" right ""} }
}