7 7
 0 1 0 0 0 0 0
 1 0 0 0 0 0 0
 0 0 0 2 0 0 0
 0 0 2 0 0 0 0
 0 0 0 0 -2 0 0
 0 0 0 0 0 -2 0
 0 0 0 0 0 0 -2
