4
0 1 1 -2 0 0 2 0 0
0 1 1 2 0 0 0 3 0
0 1 1 0 3 0 -2 0 0
-2 0 0 0 3 0 2 0 0
6
0 1 1 -2 0 0 2 0 0
0 1 1 2 0 0 0 3 0
0 1 1 0 3 0 -2 0 0
-2 0 0 0 1 -1 2 0 0
2 0 0 0 1 -1 0 3 0
0 3 0 0 1 -1 -2 0 0
0