#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <cstdint>
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N=1e9+7;
int32_t main(){
int t=1;
cin>>t;
int ar[2][9]={9,17,24,30,35,39,42,44,45,1,3,6,10,15,21,28,36,45};
while(t--){
int a,b,sum=0,fark;
cin>>a>>b;
fark=b-a;
a=(a-1)%9+1;
b=(b-1)%9+1;
if(fark>18){
fark-=9;
fark+=a-b;
sum+=45*(fark/9);
sum+=ar[0][9-a]+ar[1][b-1];
}
else{
for(int j=0;j<=fark;j++,a++){
if(a==10)a=1;
sum+=a;
}
}
cout<<sum<<endl;
}
}
