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