1 #include<iostream>
 2 #include<cstdio>
 3 using namespace std;
 4 int main()
 5 {
 6     long long  a[52];
 7     int i;
 8     a[1]=1,a[2]=2;
 9     for(i=3;i<51;i++)
10         a[i]=a[i-1]+a[i-2];
11     int T;
12     int c,d;
13     cin>>T;
14     while(T--)
15     {
16         cin>>c>>d;
17         cout<<a[d-c]<<endl;
18     }
19 }