3, 4
5, 6
7, 8
10, 11
14, 15
19, 20
24, 25
28, 29
4, 6
4, 7
4, 9
4, 12
4, 16
15, 17
15, 18
15, 20
15, 23
2, 12
3, 25
5, 28
6, 18
12, 26
2, 3
2, 3, 4
2, 3, 4, 5
2, 3, 4, 5, 6
4, 12, 25
10, 11, 12