
7 7
1	1 0 0		0 0	0
1	-1 0 0 	1 0	0
1	0 1 0		0 0	0
1	1 -1 0	0 0	0
1	0 0 1		0 0 	0
1	1 -1 -1 	0 0 	0
0	1 1 1 	0 -1 	0

0 4

