#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define vint vector <int>
#define vll vector <ll>
#define vbool vector<bool>
#define pairint pair<int,int>
#define pairll pair<ll,ll>
#define fi first
#define sc second
#define rever greater<ll>()
using namespace std;
void solve(ll tc){
ll l, r; cin >> l >> r; l--;
ll x = l%9 + 1;
l = (l/9 * 45) + x * (x-1) / 2;
x = r%9 + 1;
r = (r/9 * 45) + x * (x-1) / 2;
cout << r - l << endl;
}
int main(){
ll t; cin >> t;
for(int i = 1; i <= t; i++){
solve(i);
}
}
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