13[3−3−12]\frac{1}{3}\left[\begin{array}{cc}3 & -3 \\-1 & 2\end{array}\right]31[3−1−32]
13[3−1−32]\frac{1}{3}\left[\begin{array}{cc}3 & -1 \\-3 & 2\end{array}\right]31[3−3−12]
13[−331−2]\frac{1}{3}\left[\begin{array}{cc}-3 & 3 \\1 & -2\end{array}\right]31[−313−2]
13[3−13−2]\frac{1}{3}\left[\begin{array}{ll}3 & -1 \\3 & -2\end{array}\right]31[33−1−2]