#include <bits/stdc++.h>
using namespace std;
const int MAX = (int)1e5 + 55;
const int INF = (int)1e9 + 77;
const int MOD = (int)1e9 + 7;
const double PI = 2 * acos(0.0);
const double EPS = 1e-7;
vector<long long> v;
void build(int idx, int cnt, long long num) {
  if (idx == 19 || cnt > 3) return;
  v.push_back(num);
  for (int i = 0; i <= 9; ++i) build(idx + 1, cnt + (i != 0), num * 10 + i);
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  for (int i = 1; i <= 9; ++i) build(1, 1, i);
  v.push_back(0);
  v.push_back((long long)1e18);
  sort(v.begin(), v.end());
  int tc;
  cin >> tc;
  while (tc--) {
    long long l, r;
    cin >> l >> r;
    cout << upper_bound(v.begin(), v.end(), r) -
                lower_bound(v.begin(), v.end(), l)
         << '\n';
  }
  return 0;
}
