#include <bits/stdc++.h>
#include <atcoder/dsu>
#include <atcoder/scc>
using namespace std;

int main() {
	int N;
	cin >> N;
	vector<int> d(N);
	atcoder::dsu uf(N);
	atcoder::scc_graph scc(N);
	for (int i = 0; i < N; i++) {
		int M; cin >> M;
		vector<int> A(M);
		for (int j = 0; j < M; j++) cin >> A[j];
		for (int j = 0; j < M; j++) {
			A[j]--;
			d[A[j]]++;
			uf.merge(i, A[j]);
			scc.add_edge(i, A[j]);
		}
	}
	bool ok1 = true, ok2 = true, ok3 = false;
	vector<int> s = scc.scc()[0];
	for (int i: s) if (i == 0) ok3 = true;
	for (int i = 1; i < N; i++) {
		if (d[i] == 0) ok1 = false;
		if (!uf.same(0, i)) ok2 = false;
	}
	if (ok1 && ok2 && ok3) cout << "Yes\n";
	else cout << "No\n";
}