#include<bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t;
    cin>>t;
    while(t--)
    {
        unsigned long long int a,b;
        cin>>a>>b;
        if(a-b>=2)  cout<<"YES\n";
        if(a-b<2)    cout<<"NO\n";
    }
    return 0;
}