#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int q;
    cin>>q;
    while(q--)
        {
        int n;
        cin>>n;
        for(int i=0;i<n;++i)
            {
            cin>>x[i]>>y[i];
        }
        if(n<=2)
            cout<<"YES";
       
            
    }
    return 0;
}