2 3
1 1 -281
1 -1 14000

-1

6 6
0  -392     0     8    -1     0
0   392     8     0     1     0
1    -1     0     0     0     0
1     1     0     0     0    35
1   392     0     0     1     0
1  -392     0     0    -1   280

Urs_unknowns