7 8
   0    1    1    0    0    1    0    2
   0    0    0    1    0   -2    0    6
   0    0    0    0    1   -1    0   -1
   0    0    0    0    0    0    1    0
   1    0    1    0    0    0    0    0
   1    0   -1    0    0   -1    0   -2
   1    0    0    0    0    1    0   -3

0 4
