#include <bits/stdc++.h>
using namespace std;
long long int sum() { return 0; }
template <typename T, typename... Args>
T sum(T a, Args... args) {
  return a + sum(args...);
}
template <typename T1, typename T2>
istream& operator>>(istream& in, pair<T1, T2>& a) {
  in >> a.first >> a.second;
  return in;
}
template <typename T1, typename T2>
ostream& operator<<(ostream& out, pair<T1, T2> a) {
  out << a.first << " " << a.second;
  return out;
}
const long long INF = 1e18;
const int32_t M = 1e9 + 7;
const int32_t MM = 998244353;
const long long int N = 200005;
vector<long long int> ans = {INF};
void precal(long long int pos, long long int c, long long int num) {
  if (pos == 18) {
    ans.push_back(num);
    return;
  }
  precal(pos + 1, c, num * 10);
  if (c < 3) {
    for (long long int i = 1; i <= 9; i++) {
      precal(pos + 1, c + 1, num * 10 + i);
    }
  }
}
void solve() {
  long long int l, r;
  cin >> l >> r;
  cout << upper_bound(ans.begin(), ans.end(), r) -
              lower_bound(ans.begin(), ans.end(), l)
       << "\n";
}
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  precal(0, 0, 0);
  sort(ans.begin(), ans.end());
  long long int t = 1;
  cin >> t;
  while (t--) {
    solve();
  }
}
