#include <bits/stdc++.h>
using namespace std;
int t, lead;
long long c[50][50], ans;
string l, r, s, t1 = "000000000000000000", t2 = "999999999999999999";
void solve(int pos, int ct, string &l, string &r) {
  if (pos > 17 || ct < 0) return;
  if (pos == 16) {
    int useless = 1;
  }
  if (l[pos] == r[pos]) {
    if (l[pos] == '0') {
      if (pos == 17) {
        ans++;
      }
      solve(pos + 1, ct, l, r);
    } else {
      if (pos == 17 && ct > 0) {
        ans++;
      }
      solve(pos + 1, ct - 1, l, r);
    }
  } else {
    if (l[pos] == '0')
      solve(pos + 1, ct, l, t2);
    else
      solve(pos + 1, ct - 1, l, t2);
    solve(pos + 1, ct - 1, t1, r);
    if (pos < 17) {
      long long old = ans;
      for (int k = 0; k <= min(ct - 1, 17 - pos); k++)
        ans += c[k][17 - pos] * 1LL * pow(9, k) * (r[pos] - l[pos] - 1);
    } else if (pos == 17) {
      if (ct == 0) {
        if (l[pos] == '0') {
          ans++;
        }
      } else if (ct > 0) {
        ans += r[pos] - l[pos] + 1;
      }
    }
  }
}
void combi() {
  c[0][1] = 1;
  c[1][1] = 1;
  for (int j = 2; j < 50; j++) {
    c[0][j] = 1;
    for (int i = 1; i <= j; i++) c[i][j] = c[i - 1][j - 1] + c[i][j - 1];
  }
}
int main() {
  combi();
  cin >> t;
  while (t--) {
    cin >> l >> r;
    ans = 0;
    if (l == r && r == "1000000000000000000") {
      printf("1\n");
      continue;
    }
    if (r == "1000000000000000000") {
      ans++;
      r = "999999999999999999";
    }
    lead = 18 - l.length();
    s = "";
    for (int i = 0; i < lead; i++) s = s + "0";
    s = s.append(l);
    l = s;
    s = "";
    lead = 18 - r.length();
    for (int i = 0; i < lead; i++) s = s + "0";
    s = s.append(r);
    r = s;
    solve(0, 3, l, r);
    printf("%I64d\n", ans);
  }
  return 0;
}
