#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    long long int x, y;
    cin >> x >> y;
    if (x - y > 1)
      cout << "YES" << '\n';
    else
      cout << "NO" << '\n';
  }
}
