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