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