21 17RA-2D
1 g 0 2 21 1
2 G 1 3 20 2
3 C 2 4 19 3
4 G 3 5 18 4
5 U 4 6 17 5
6 A 5 7 0 6
7 A 6 8 0 7
8 G 7 9 15 8
9 G 8 10 14 9
10 A 9 11 0 10
11 U 10 12 0 11
12 U 11 13 0 12
13 A 12 14 0 13
14 C 13 15 9 14
15 C 14 16 8 15
16 U 15 17 0 16
17 A 16 18 5 17
18 U 17 19 4 18
19 G 18 20 3 19
20 C 19 21 2 20
21 C 20 0 1 21