#include <bits/stdc++.h>
using namespace std;
long long T, x, y;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cin >> T;
  while (T--) {
    cin >> x >> y;
    if (x - y >= 2)
      cout << "YES" << endl;
    else
      cout << "NO" << endl;
  }
}
