2/1, 2/2, 3, 4/1
2/1, 2/2, 3, 4/1, 10/1, 12/1, 12/2, 13/2, 14/1, 14/2, 15, 17, 19, 21, 23, 4/1, 5, 6, 7, 8, 9/1, 9/2