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