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