{{1, 0, -1, 1, 0, 2, 1, 1, 0, -1, 0, 2, 0, -6, 0, -1, 0, 1, 0}, 
 {0, 1, 0, -2, 0, -2, -2, -2, 0, 2, 0, -4, 1, 6, 1, 2, -1, 0, -1}, 
 {0, 0, 0, 0, 1, 0, -1, 0, 1, 1, -1, -2, 2, -1, 0, 1, -1, 0, 0}}
