//#include <atcoder/all>
#include<bits/stdc++.h>
using namespace std;
//using namespace atcoder;
using ll = long long;
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
using Graph = vector<vector<pair<ll, ll>>>;
vector<ll> fact, factinv, inv;
ll mod = 998244353;
ll gcd(ll(a), ll(b)) {
	ll c = a;
	while (a % b != 0) {
		c = a % b;
		a = b;
		b = c;
	}
	return b;
}

int main() {
   ll T;
   cin>>T;
   rep(t,T){
       ll N,M;
       cin>>N>>M;
       rep(i,M){
           ll Z,X;
           cin>>Z>>X;
       }
       cout<<(N==1?"No":"Yes")<<endl;

   }
}