#include <bits/stdc++.h>
using namespace std;
long long dp[20][5][2];
long long l, r;
string s;
long long fun(long long pos, long long cnt, long long tight) {
  if (pos == s.length()) {
    return 1;
  }
  if (dp[pos][cnt][tight] != -1) {
    return dp[pos][cnt][tight];
  }
  long long end = tight ? (s[pos] - '0') : 9;
  long long ans = 0;
  for (long long i = 0; i <= end; i++) {
    long long cntupd = cnt + (i > 0);
    if (cntupd <= 3) {
      ans += fun(pos + 1, cntupd, (tight & (i == end)));
    }
  }
  return dp[pos][cnt][tight] = ans;
}
int main() {
  long long t;
  cin >> t;
  while (t--) {
    cin >> l >> r;
    memset(dp, -1, sizeof(dp));
    s = to_string(r);
    long long x = fun(0, 0, 1);
    l -= 1;
    s = to_string(l);
    memset(dp, -1, sizeof(dp));
    x -= fun(0, 0, 1);
    cout << x << endl;
  }
}
