2 3

1 1 -281

1 -1 14000

-1

6 6

0  -392     0     8    -1     0

0   392     8     0     1     0

1    -1     0     0     0     0

1     1     0     0     0    35

1   392     0     0     1     0

1  -392     0     0    -1   280

Urs_unknowns