0 4

-1

7 6

1 2  6 0 0 -9

1 5 -3 0 0 0

1 2 -10 0 0 15

1 -2 6 0 0 -3

1 -2 -6 0 0 17

1 0 1 -1 0 0

1 1 0 0 -1 0