1
11
4
0 1 0 1 0 0 0 -1 0 0 -10
0 -1 1 0 0 0 1 0 0 -10 1
0 1 -1 0 0 1 0 0 10 1 0
1 0 0 0 -9 -1 0 0 1 0 0
