(1, 13) (1, 18) (3, 18) (6, 13) (6, 18) (9, 18) (13, 18) | (1, 20) (1, 26) (1, 29) (3, 20) (3, 27) (3, 29) (6, 19) (6, 27) (6, 29) (9, 20) (9, 26) (9, 29) (13, 20) (13, 23) (13, 25) (13, 29) (18, 19) (18, 20) (18, 23) (18, 25) (18, 24) (18, 28) (18, 27) (18, 26) (20, 19) (20, 27) (20, 25) (29, 25) (29, 24) | (19, 1) (20, 21) (23, 6) (25, 9) (24, 9) (28, 13) (27, 13) (26, 13) (28, 27) (28, 26) |