2  1  0  0  0  0
-1  0  0  0  0  0
-2 -2  1  0  0  0
 0  3 -1  2  1  0
 9 -5  6  0 -1  1
 8 -9  7 -1 -3  2

1 0 0 0 0 0
0 1 1 0 0 0
0 0 1 0 0 0
0 0 0 1 1 0
0 0 0 0 1 1
0 0 0 0 0 1

-1 1 1 0 0 0
1 -1 0 0 0 0
0 -2 0 0 0 0
-4 8 0 1 1 1
1 -7 8 -1 0 0
16 16 0 2 -1 0