#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
using namespace std;
typedef long long ll;
const int mod=1e9+7;
int main(){
	int t,n;
	cin>>t;
	while(cin>>n){
		cout<<(n>=2?"Yes":"No")<<endl;
		cin>>n;
		for(int i=0;i<n;i++)
			cin>>t>>t;
	}
}