<<< native
[ EIdentifier "x"
, ESymbol Rel "="
, EGrouped
    [ EDelimited
        "("
        ")"
        [ Right
            (EArray
               [ AlignCenter ] [ [ [ ENumber "0" ] ] , [ [ ENumber "0" ] ] ])
        ]
    , EDelimited
        "("
        ")"
        [ Right
            (EArray
               [ AlignCenter ] [ [ [ ENumber "0" ] ] , [ [ ENumber "0" ] ] ])
        ]
    , EDelimited
        "("
        ")"
        [ Right
            (EArray
               [ AlignCenter ] [ [ [ ENumber "0" ] ] , [ [ ENumber "0" ] ] ])
        ]
    ]
]
>>> eqn
x = {left ( matrix{
ccol{ 0 above 0 }
} right ) left ( matrix{
ccol{ 0 above 0 }
} right ) left ( matrix{
ccol{ 0 above 0 }
} right )}