\[ \left[ \begin{array}{ c | c } \begin{matrix} 0 & 1 \\ 1 & 0 \end{matrix} & \begin{matrix} \text{\Huge $0$} \end{matrix} \\ \hline \begin{matrix} \text{\Huge $0$} \end{matrix} & \begin{matrix} 0 & c \\ d & 0 \end{matrix} \end{array} \right] \]