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