6 4

3
0 0 1 0 0 0 3 0
0 0 0 1 0 0 2 0
0 0 0 0 0 0 -1 7/2

3
0 0 0 0 1 0 3 0
0 0 0 0 0 1 2 0
0 0 0 0 0 0 -1 -7/2

2
0 0 1 0 1 0 1 0
0 0 0 0 0 0 -1 0

2
0 0 0 1 0 1 1 0
0 0 0 0 0 0 -1 0

1 X 0 1
2 X 0 1