#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    long long a, b;
    cin >> a >> b;
    if (abs(a - b) > 1)
      cout << "YES"
           << "\n";
    else
      cout << "NO"
           << "\n";
  }
}
