(15; 3), (15; 4), (10; 1), (9; 2), (8; 2), (7; 1), (3; 1), (-4; 0), (-16; -2), (-5; -3), (-6; -4), (-3; -4), (-2; -3), (-1; -4), (0; -3), (4; -3), (4; -4), (7; -4), (8; -4), (10; -4), (8; -3), (15; 0), (15; 3); (9; 1)