0  (0,)
1  (1, 7, 15)
2  (2, 6, 8)
3  (3,)
4  (4, 11, 16)
5  (5,)
6  (9,)
7  (10, 17, 29)
8  (12, 25, 30)
9  (13, 24, 28)
10  (14,)
11  (18,)
12  (19, 20, 21)
13  (22,)
14  (23,)
15  (26,)
16  (27,)
17  (31, 34, 35)
18  (32,)
19  (33,)
20  (36,)