This is $X$.  Now it is $latex \begin{array}1 & 2 \\3 & 4\end{array}$.

$\displaystyle \left. \begin{array} \fbox{1} & \fbox{1} & \fbox{1} & \fbox{2} & \fbox{3} & \fbox{3} \\ \fbox{2} & \fbox{2} & \fbox{2} & \fbox{3} & & \\ \fbox{3} & \fbox{3} & & & & \end{array} \right.$