
5 5
1 0 0 0 0
0 1 1 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1

6 6
1 1 0 0 0 -1
1 -1 0 0 1 0
1 0 1 0 0 -1
1 2 -1 0 0 0
1 0 -1 1 0 0
1 0 0 -1 1 0

1 3
1 1 -1

