#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(n); i++)


int main(){
  int T; cin >> T;
  while(T--){
    int N; cin >> N;
    vector<vector<int>> E(N);
    rep(i,N-1){
      int u,v; cin >> u >> v; u--; v--;
      E[u].push_back(v);
      E[v].push_back(u);
    }
    
    int leaf_count = 0;
    rep(i,N) if(E[i].size() == 1) leaf_count += 1;
    if(leaf_count * 2 < N) cout << "No\n";
    else cout << "Yes\n";
  }
  return 0;
}




struct ios_do_not_sync {
    ios_do_not_sync() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;