[−121]\left[\begin{array}{c}-1 \\2 \\1\end{array}\right]−121
[−121−121−121]\left[\begin{array}{lll}-1 & 2 & 1 \\-1 & 2 & 1 \\-1 & 2 & 1\end{array}\right]−1−1−1222111
[−1−1−1222111]\left[\begin{array}{ccc}-1 & -1 & -1 \\2 & 2 & 2 \\1 & 1 & 1\end{array}\right]−121−121−121
[−121]\left[\begin{array}{lll}-1 & 2 & 1\end{array}\right][−121]
