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