#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  long long int t;
  cin >> t;
  while (t--) {
    long long int x, y;
    cin >> x >> y;
    if (x - y <= 1)
      cout << "NO\n";
    else
      cout << "YES\n";
  }
  return 0;
}
