{{1, -1, 0, 0, 1, 2, -1, 0, 1, 1, -1, 4, -2, -5, -1, -2, 1, 0, 1}, 
 {0, 0, 1, 0, 0, -2, 0, 0, 0, 0, 0, -3, 0, 5, 0, 1, 0, -1, 0}, 
 {0, 0, 0, 1, 0, 0, 1, 1, 0, -1, 0, -2, 2, -1, 0, 1, -1, 0, 0}}
