1 0 0 0 0 1 0 0 0 0 1 0
-1 0 0 1/4 0 0 1 -1/4 0 1 0 1/4
1 0 0 0 0 -1 0 0 0 0 -1 1/2
-1 0 0 1/4 0 0 -1 1/4 0 -1 0 1/4