<<< native
[ ENumber "2"
, ENumber "5"
, EGrouped [ EIdentifier "y" , ESymbol Bin "+" , ENumber "3" ]
, EGrouped [ EIdentifier "x" , ESymbol Bin "+" , ENumber "3" ]
, EGrouped
    [ EIdentifier "x" , ESymbol Bin "+" , EIdentifier "\945" ]
, EArray
    [ AlignCenter , AlignCenter ]
    [ [ [ ENumber "2" ] , [ ENumber "3" ] ]
    , [ [ ENumber "4" ] , [ ENumber "5" ] ]
    ]
]
>>> eqn
2 5 {y + 3} {x + 3} {x + alpha} matrix{
ccol{ 2 above 4 }
ccol{ 3 above 5 }
}