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