#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
    int T;
    cin>>T;
    for(int i=0;i<T;i++){
        int N,M;
        cin>>N>>M;
        for(int j=0;j<M;j++){
            int a,b;
            cin>>a>>b;
        }
        if(N != 1) cout<<"Yes"<<endl;
        else cout<<"No"<<endl;
    }
}