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