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