3
3-4-5
1-2-3-
-2-5-6
6-7-10
4-5-8
6-7-8
2
11-12
9-10
9-12
13-14
17-18
15-16
19-20
21-24
19-22
21-22
25-26
23-24
23-26
26-27
13-14-17
25-26-29
26-27-28-
19-14-17-
30-31
29-30