{{1, 0, -1, 0, 1/3, 0, -1/3, 0, -1/6, 1/3, -1/2, -2/3, 0, 2/3, 0, -1/6, 0, 
  1/6, 0, 1/6, -1/6, 1/3}, {0, 1, 0, -1, -1/3, -1/3, 0, -1/3, 0, 0, 0, 0, 
  -2/3, 0, 2/3, 1/6, 1/6, 0, 1/6, 0, 0, 0}}
