(0;0), (1; -1), (1;-2), (2; -2) , (2;3), (4; 3), (4; -2) , (5; -2) ,(5;0), (6; -1), ( 6;-2), (7; -2), (7;2), (9;2), (9; - 2), (11; -2),(11; 5), (12;5), (12;- 3), (14; -4), (14; - 6), (-15; -6), (-13; -1), (-13;-2), (-7; -2), (-8; 0), (-7; 2), (-6; 2), , (-6; 7), (-5; 7),(-5; -2), (-3; -2), (-3; 4), (-1;4), (-1; -2), (0; - 2),(0;0)