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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int q,n;
    cin>>q;
    while(q--)
        {
        cin>>n;
        int x[n][n],y[n][n];
        for(i=0;i<n;i++)
            {
            cin>>x[i]>>y[i];
        }
        cout<<"YES\n";
    }
    return 0;
}