<<< native [ EArray [ AlignCenter , AlignCenter ] [ [ [ ENumber "1" ] , [ ENumber "2" ] ] , [ [ EIdentifier "x" ] , [ EIdentifier "y" ] ] ] ] >>> mml $$\begin{array}{cc}\hfill 1\hfill & \hfill 2\hfill \\ \hfill x\hfill & \hfill y\hfill \end{array}$$