(44−1−311)\left(\begin{array}{cr}44 & -1 \\-31 & 1\end{array}\right)(44−31−11)
113(44−1−311)\frac{1}{13}\left(\begin{array}{cr}44 & -1 \\-31 & 1\end{array}\right)131(44−31−11)
113(−44131−1)\frac{1}{13}\left(\begin{array}{rr}-44 & 1 \\31 & -1\end{array}\right)131(−44311−1)
113(−31144−1)\frac{1}{13}\left(\begin{array}{cc}-31 & 1 \\44 & -1\end{array}\right)131(−31441−1)