#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    long long int a, b;
    cin >> a >> b;
    cout << (a - b != 1 ? "YES" : "NO") << '\n';
  }
  return 0;
}
