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