0 2

-1

16 18
1 0 0 0 0 0 0 0 0 -1 0 0 1 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0 -1 0 0 1 0 0 0 0
1 0 0 0 0 0 0 0 0 0 0 -1 0 0 1 0 0 0
1 0 0 0 0 0 0 0 0 0 0 0 0 1 -1 0 0 0
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0


0 0 0 0 -1 0 0 0 0 1 -1 0 0 0 0 0 0 0
0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 0 0 0

0 -1 0 0 0 0 0 0 0 0 1 -1 0 0 0 0 0 0

0 0 0 0 0 0 -1 0 0 0 0 0 1 -1 0 -1 0 0
0 0 0 0 0 0 0 -1 0 0 0 0 0 0 1 0 0 0
0 0 0 0 0 0 0 0 -1 0 0 0 0 0 0 0 1 0

0 0 0 0 0 0 0 0 0 0 0 0 0 1 -1 0 0 0
0 0 -1 0 0 0 0 0 0 0 0 0 0 0 0 1 -1 0

1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1
1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 -1