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