1   2   3  -2
1   5   1   3
0   4   2  -1

1  -1   2   1
-1 -1   2   0
-3 -1   2   2

1   4   5  -2
3   0   2  -1
6   3   1   2
2  -3  -2   1

-1 -1   1   1
2   1   0   5
-3  2   1  -1
-1 -2   1  -2
