[ EArray
    [ AlignCenter ]
    [ [ [ EArray
            [ AlignCenter , AlignCenter ]
            [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
            , [ [ EIdentifier "x" ] , [ EIdentifier "y" ] ]
            ]
        ]
      ]
    , [ [ EArray
            [ AlignCenter , AlignCenter ]
            [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
            , [ [ EIdentifier "x" ] , [ EIdentifier "y" ] ]
            ]
        ]
      ]
    , [ [ EArray
            [ AlignCenter , AlignCenter ]
            [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
            , [ [ EIdentifier "x" ] , [ EIdentifier "y" ] ]
            ]
        ]
      ]
    ]
]