#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 1000000000000000001


int main(){
	
	int n;
	cin>>n;
	vector<vector<int>> E(n);
	scc_graph S(n);
	rep(i,n){
		int m;
		cin>>m;
		rep(j,m){
			int a;
			cin>>a;
			a--;
			E[i].push_back(a);
			S.add_edge(i,a);
		}
	}
	auto s = S.scc();
	vector<int> pos(n);
	rep(i,s.size()){
		for(auto x:s[i]){
			pos[x] = i;
		}
	}
	if(pos[0]!=0){
		cout<<"No"<<endl;
		return 0;
	}
	rep(i,s.size()-1){
		bool f = false;
		rep(j,s[i].size()){
			rep(k,E[s[i][j]].size()){
				if(pos[E[s[i][j]][k]]==i+1){
					f = true;
					break;
				}
			}
		}if(!f){
			cout<<"No"<<endl;
			return 0;
		}
	}
	cout<<"Yes"<<endl;
	
	return 0;
}