0-1, 1-1, 2-1, 3-1, 3-2, 4-2, 4-3, 4-4, 5-4, 5-5, 5-6, 6-6, 6-7, 6-8, 7-8, 8-8, 9-8, 9-9, 10-9, 10-10, 10-11, 11-11, 12-11, 13-11, 14-11, 15-11, 15-12, 16-13, 17-13, 17-14, 17-15, 18-15, 19-15, 19-16, 20-16, 20-17, 20-18, 20-19, 20-20, 20-21, 21-21, 22-21.
0-1, 1-1, 2-1, 3-1, 3-2, 4-2, 4-3, 4-4, 5-4, 5-5, 5-6, 6-6, 6-7, 6-8, 7-8, 8-8, 9-8, 9-9, 10-9, 10-10, 10-11, 11-11, 12-11, 13-11, 14-11, 15-11, 15-12, 16-13, 17-13, 17-14, 17-15, 18-15, 19-15, 19-16, 20-16, 20-17, 20-18, 20-19, 20-20, 20-21, 21-21, 22-21.