[ EDelimited
    "("
    ")"
    [ Right
        (EArray
           [ AlignCenter ]
           [ [ [ EIdentifier "U" ] ] , [ [ EIdentifier "V" ] ] ])
    ]
, ESymbol Rel "="
, EDelimited
    "("
    ")"
    [ Right
        (EArray
           [ AlignCenter ]
           [ [ [ EIdentifier "U" ] ] , [ [ EIdentifier "V" ] ] ])
    ]
]