<<< 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 "''"))
                       ])
                ]
            ]
        ]
      ]
    ]
]
>>> tex
\begin{matrix}
\text{single integral} & {{\int x}{\int M}\left. \int\frac{x}{o} \right.\left. \int\frac{A}{o} \right.\left. \int\frac{x}{A} \right.\left. \int\frac{A}{M} \right.\left. \int\frac{.}{''} \right.} \\
\text{double integral} & {\left. \int\left. \int x \right. \right.\left. \int\left. \int M \right. \right.\left. \int\left. \int\frac{x}{o} \right. \right.\left. \int\left. \int\frac{A}{o} \right. \right.\left. \int\left. \int\frac{x}{A} \right. \right.\left. \int\left. \int\frac{A}{M} \right. \right.\left. \int\left. \int\frac{.}{''} \right. \right.} \\
\text{double nested integral} & {\left. \int\left. \int x \right. \right.\left. \int\left. \int M \right. \right.\left. \int\left. \int\frac{x}{o} \right. \right.\left. \int\left. \int\frac{A}{o} \right. \right.\left. \int\left. \int\frac{x}{A} \right. \right.\left. \int\left. \int\frac{A}{M} \right. \right.\left. \int\left. \int\frac{.}{''} \right. \right.}
\end{matrix}