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