a,b,is_true
1,1,true
2,2,true
3,3,true
4,45,true
5,6,true
6,2,true
7,4,true
8,1,true
9,1,true
10,4,true
11,4,true
12,1,true
13,3,true
14,455,true
15,1,false
16,3,false
17,5,false
18,9,false
19,1,na
20,5,na
21,8,na