<<< native [ EDelimited "{" "|" [ Right (EArray [ AlignCenter ] [ [ [ EIdentifier "U" ] ] , [ [ EIdentifier "V" ] ] ]) ] , ESymbol Rel "=" , EDelimited "|" "}" [ Right (EArray [ AlignCenter ] [ [ [ EIdentifier "U" ] ] , [ [ EIdentifier "V" ] ] ]) ] ] >>> eqn left { matrix{ ccol{ U above V } } right | = left | matrix{ ccol{ U above V } } right }