6 6
   0    0    4    0   -1    1 
   1    4    0   -1  -20  -37 
   1    4    0    0  -21  -43 
   1   -4    0    1   20   38 
   1   -1    0    0    5   14 
   1    0    0    0    1   -5 
1 4
   1    0    0    1 
