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