Characteristic polynomial
$$\begin{equation}\lambda \left(\lambda + 4\right)^{2} \left(\lambda^{5} + 11 \lambda^{4} + 47 \lambda^{3} + 128 \lambda^{2} + 316 \lambda + 389\right) \left(\lambda^{8} - 12 \lambda^{7} + 64 \lambda^{6} - 440 \lambda^{5} + 584 \lambda^{4} - 4256 \lambda^{3} + 8208 \lambda^{2} - 36000 \lambda + 236624\right)\notag\end{equation}$$
Minimal polynomial
$$\begin{equation}\lambda \left(\lambda + 4\right) \left(\lambda^{5} + 11 \lambda^{4} + 47 \lambda^{3} + 128 \lambda^{2} + 316 \lambda + 389\right) \left(\lambda^{8} - 12 \lambda^{7} + 64 \lambda^{6} - 440 \lambda^{5} + 584 \lambda^{4} - 4256 \lambda^{3} + 8208 \lambda^{2} - 36000 \lambda + 236624\right)\notag\end{equation}$$
Quantum multiplication matrix
$$\begin{equation}\begin{pmatrix}0 & 2 & 0 & 2 & 4 & 0 & 0 & 6 & 6 & 6 & 6 & 8 & 8 & 24 & 16 & 20 \\ 1 & -1 & 0 & 1 & 0 & 0 & 4 & 0 & 0 & 0 & 0 & 6 & 6 & 6 & 0 & 16 \\ 1 & 0 & 0 & 1 & 2 & 2 & 0 & 0 & 0 & -6 & 0 & -3 & 0 & 0 & -12 & 0 \\ 1 & 1 & 0 & -1 & 0 & 0 & 0 & 0 & 4 & 4 & 4 & 0 & 0 & 0 & 12 & 0 \\ 1 & 0 & 0 & 0 & 0 & 0 & 2 & 2 & 0 & 2 & 2 & 3 & 0 & 6 & 6 & 8 \\ 0 & 2 & 1 & 1 & 0 & -1 & 2 & 1 & 0 & 0 & 0 & -2 & 4 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 & 1 & 0 & -1 & 0 & 0 & 0 & 1 & 2 & 0 & 0 & 0 & 6 \\ 0 & 0 & 1 & 2 & 0 & 1 & 0 & -1 & 0 & -1 & 2 & 0 & 0 & 4 & 0 & 0 \\ 0 & 0 & 1 & 0 & 2 & 0 & 0 & 0 & 0 & -1 & 1 & 0 & 2 & 2 & -4 & 0 \\ 0 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 2 & 1 & 0 & 2 & 0 & 0 & 4 & 0 \\ 0 & 0 & 0 & 1 & 1 & 0 & 1 & 0 & 0 & 1 & -1 & 0 & 0 & 0 & 4 & 0 \\ 0 & 0 & 0 & 0 & 0 & 2 & 0 & 3 & 0 & 2 & 0 & 0 & 2 & 2 & 0 & 4 \\ 0 & 0 & 0 & 0 & 0 & 1 & 3 & 0 & 1 & 0 & 1 & 0 & -1 & 1 & 0 & 0 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 1 & 0 & 3 & 0 & 1 & -1 & 0 & 0 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 2 & 1 & 0 & 0 & 0 & 1 & 0 & 2 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 3 & 4 & 2 & 0\end{pmatrix}\notag\end{equation}$$