1 2; 1 -2; -1 2; -1 -2
1 2 3; 1 2 -3; 1 -2 3; 1 -2 -3; -1 2 3; -1 2 -3; -1 -2 3; -1 -2 -3
1 2 -3 -4; -1 -2; 1 -2 3 -4; -1 2 -3 4; 1 -2 -3 4; -1 2 3 -4