(12−314−1)\left(\begin{array}{cc}12 & -3 \\14 & -1\end{array}\right)(1214−3−1)
(5−106)\left(\begin{array}{cc}5 & -1 \\0 & 6\end{array}\right)(50−16)
(50−16)\left(\begin{array}{ll}5 & 0 \\-1 & 6\end{array}\right)(5−106)
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