A \( \left [ \begin{matrix} \frac{1}{4} & \frac{1}{5} & 0 & 0 \\ \frac{1}{3} & \frac{1}{4} & 0 & 0 \\ 0 & 0 & \frac{1}{3} & \frac{1}{2} \\ 0 & 0 & \frac{1}{4} & \frac{1}{3} \end{matrix} \right ] \)
B \( \left [ \begin{matrix} \frac{1}{4} & - 5 & 0 & 0 \\ - 3 & \frac{1}{4} & 0 & 0 \\ 0 & 0 & \frac{1}{3} & - 2 \\ 0 & 0 & - 4 & \frac{1}{3} \end{matrix} \right ] \)
C \( \left [ \begin{matrix} 4 & - 3 & 0 & 0 \\ - 5 & 4 & 0 & 0 \\ 0 & 0 & 3 & - 4 \\ 0 & 0 & - 2 & 3 \end{matrix} \right ] \)
D \( \left [ \begin{matrix} 4 & - 5 & 0 & 0 \\ - 3 & 4 & 0 & 0 \\ 0 & 0 & 3 & - 2 \\ 0 & 0 & - 4 & 3 \end{matrix} \right ] \)
