#include <cstdio>
#include <iostream>
#include <string>
using namespace std;
int main(){
int t;
cin>>t;
int arr[2][9]={9,17,24,30,35,39,42,44,45,1,3,6,10,15,21,28,36,45};
long long a,b,fark,sum;
for (int i = 0; i < t; ++i)
{
sum=0;
cin>>a;
cin>>b;
fark=b-a;
a=(a-1)%9+1;
b=(b-1)%9+1;
if(fark>18){
fark=fark-9+a-b;
sum+=arr[0][9-a];
sum+=arr[1][b-1];
sum+=45*(fark/9);
cout<<sum;
}
else{
for (long long int j = 0; j <=fark; ++j,a++)
{
if(a==10)a=1;
sum+=a;
}
cout<<sum<<endl;
}
}
return 0;
}
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