2
6-7
1-2
5-6
3-4
3
10-11-12
3-4-5
7-8-9
5-6-7
13-14
8-9
12-13
10-11
17-18-19
14-15-16
12-13-14
20-21
15-16
19-20
17-18
24-25
21-22