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

vector<pair<int,int> > p;
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int q,n,x,y,m1;
    cin>>q;
    while(q--)
        {
        cin>>n;
        for(int i=0;i<n;i++)
            {
            cin>>x>>y;
            p.push_back(make_pair(x,y));
            
        }
       cout<<"YES"<<"\n";
        
    }
    return 0;
}