C

0 2

0

3

1
0 2
0 0 0

1
0 2
0 0 0

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

0

3

1 3
0 -1 0

1 3
0 -1 1

1 4
0 -1 1 0

0