# Rob Schreiber's example

8 7
1  1  0   0   0 0    0
1 -1  0   0   0 0    3
1  0  1   0   0 0    0
1  0 -1   0   0 0    4
1  0  0   1   0 0    0 
1  0  0  -1   0 0    5
0  1  1   0  -1 0    0
0  2  0  -3   0 -1   0
 
0 4
1  1 0  -1000
1  0 1  -1000

