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