c

0 2

0

2

1
2 3
1 1 0
1 -1 10
0 0 0

1
2 3
1 1 0
1 -1 10
0 0 0

0

2

3 6
0 -1 0 0 1 0
0 0 -1 0 0 0
0 0 0 -1 0 0

3 6
0 -1 0 0 1 0
0 0 -1 0 0 -1
0 0 0 -1 0 0

0