\left(
 \begin{array}{cccccccc}
 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0\\
 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0\\
 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0\\
 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0\\
 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0\\
 0 & 0 & 0 & 0 & 0 & 3 & 1 & 0\\
 0 & 0 & 0 & 0 & 0 & 0 & 3 & 0\\
 0 & 0 & 0 & 0 & 0 & 0 & 0 & 3\\
 \end{array}
\right)