<<< native [ ESqrt (EArray [ AlignCenter ] [ [ [ EPhantom (EIdentifier "ABCD") ] ] , [ [ EPhantom (EIdentifier "ABCD") ] ] , [ [ EPhantom (EIdentifier "ABCD") ] ] ]) ] >>> eqn sqrt {matrix{ ccol{ {hphantom ABCD} above {hphantom ABCD} above {hphantom ABCD} } }}