2 4
1 1 0 0
1 0 1 0
-1
20 8
0 -1 0 0 0 0 0 2
0 0 -1 0 0 0 0 1
0 0 0 -1 0 0 0 2
0 0 0 0 -1 0 0 4
1 0 0 0 1 0 0 -2
1 -2 0 2 1 0 0 -4
1 0 0 0 -1 0 1 -1
1 2 0 -2 -1 0 0 5
1 0 0 1 0 0 0 -1
1 0 -2 1 0 0 0 0
1 -2 0 2 0 0 1 -5
1 0 0 -1 0 1 0 0
1 0 2 -1 0 0 0 1
1 2 0 -2 0 0 0 3
1 0 1 0 0 0 0 0
1 -2 4 0 0 0 1 -3
1 0 -2 0 0 1 0 0
1 2 -4 0 0 0 0 3
1 2 0 0 0 0 0 1
1 -2 0 0 0 2 1 -5