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