<<< native
[ EDelimited
    "["
    "]"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "1") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "1") ])
               ]
             , [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "2") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "1") ])
               ]
             ]
           , [ [ ESpace (2 % 9) ] ]
           , [ [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "1") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "2") ])
               ]
             , [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "2") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "2") ])
               ]
             ]
           ])
    ]
, EDelimited
    "("
    ")"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
, EDelimited
    "{"
    "}"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
, EDelimited
    "\8739"
    "\8739"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
, EDelimited
    "\8741"
    "\8741"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
]
>>> typst
mat(delim: "[", frac(diff x_1, diff y_1), frac(diff x_2, diff y_1); med; frac(diff x_1, diff y_2), frac(diff x_2, diff y_2)) mat(delim: "(", 1, 2; 3, 4) mat(delim: "{", 1, 2; 3, 4) mat(delim: "||", 1, 2; 3, 4) mat(delim: "||", 1, 2; 3, 4)