1-1 1-2 10-1 10-2 11-1 11-2 12-1 12-2 13-1 13-2 14-1 14-2 15-1 15-2 16-1 16-2 17-1 17-2 18-1 18-2 19-1 19-2 2-1 2-2 20-1 20-2 21-1 21-2 22-1 22-2 23-1 23-2 24-1 24-2 3-1 3-2 4-1 4-2 5-1 5-2 6-1 6-2 7-1 7-2 8-1 8-2 9-1 9-2