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