[2−3−46]\left[\begin{array}{cc}2 & -3 \\-4 & 6\end{array}\right][2−4−36]
[0−560]\left[\begin{array}{cc}0 & -5 \\6 & 0\end{array}\right][06−50]
[5−1−51]\left[\begin{array}{cc}5 & -1 \\-5 & 1\end{array}\right][5−5−11]
[2aa21]\left[\begin{array}{ll}2 a & a \\2 & 1\end{array}\right][2a2a1]
