2 4

 1	1	0	0

 1	0	1	0

-1

20 8

 0	-1	0	0	0	0	0	2

 0	0	-1	0	0	0	0	1

 0	0	0	-1	0	0	0	2

 0	0	0	0	-1	0	0	4

 1	0	0	0	1	0	0	-2

 1	-2	0	2	1	0	0	-4

 1	0	0	0	-1	0	1	-1

 1	2	0	-2	-1	0	0	5

 1	0	0	1	0	0	0	-1

 1	0	-2	1	0	0	0	0

 1	-2	0	2	0	0	1	-5

 1	0	0	-1	0	1	0	0

 1	0	2	-1	0	0	0	1

 1	2	0	-2	0	0	0	3

 1	0	1	0	0	0	0	0

 1	-2	4	0	0	0	1	-3

 1	0	-2	0	0	1	0	0

 1	2	-4	0	0	0	0	3

 1	2	0	0	0	0	0	1

 1	-2	0	0	0	2	1	-5