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