{{1, 0, 0, 0, 1/2, 1/2, 1/2, 0, -1/2, 0, 3/4, 1/2, 1/4}, 
 {0, 1, 0, 0, -1/2, -1/2, -1/2, 0, 1/2, 0, -1/4, 0, -1/4}, 
 {0, 0, 1, 0, 1, -1, -1, -1, 1, 2, 1/2, 0, -1/2}, 
 {0, 0, 0, 1, -1, -1, -1, 0, 1, 0, 0, -1/2, -1/2}}
