   -1    0    1    0    2 -999    1    0   -1
   -2   -2   -2   -2   -2   -2   -2   -2   -2
   -1    1   -1    1   -1    1   -1    1   -1
    1   -2    3   -4    5   -6    7   -8    9
    0    0    0    0    0    0 -222 -111    0
    0    0    0    0    0    0  999  333    1
    0    0    0    0    0    0    1    2    3
    0    0    0    0    0    0    0   -1    0
    0    0    0    0    0    0    0    0 -123
    0    0    0    0    0    0    0    1    0
    0    0    0    0    0    0    0    0    1
    0    0    0    0    0    0    0    0    0
