c

0 2

0

2

1
1 3
0 -1 27
-1 0 0

1
3 4
1 1 0 -3
1 -1 0 100
0 1 -3 0
0 0 0

0

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

2 6
0 -1 0 1 0 0
0 0 -1 0 1 0

0