3 5

1   0    0   -1    3

1   0   -1    0    2

1   1    1    1   -4

3 5

1   0    0    1    0

1   1    0    0   -1

1   1    2    0    1

6 5

1   3    2    0   -1

1   3    0    2   -3

1   1    0    1   -1

1   1    1    1    0

1   1    1    0    0

1   1    0    0    1