#include<bits/stdc++.h>
using namespace std;
int main()
{
	ios_base::sync_with_stdio(false);
	int q,n;
	cin>>q;
	while(q--)
	{
		int x,y;
		cin>>n;
		vector<pair<int,int> > points;
		for(int i=0;i<n;i++)
		{
			cin>>x>>y;
			points.push_back(make_pair(x,y));
		}
		if(n<3)
		cout<<"YES\n";
	}
	return 0;
}