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

int N;
bool ans = false;
vector<vector<int>> To;
vector<bool> seen(100001, false);
void dfs(int v, int l) {
  if(l == N) {
    ans = true;
    return;
  }
  seen.at(v) = true;
  for(int next_v : To.at(v)) {
    if(seen.at(next_v)) {
      continue;
    }
    dfs(next_v, l + 1);
  }
  seen.at(v) = false;
}

int main() {
  cin >> N;
  int M;
  To.assign(N + 1, vector<int>(0, 0));
  for(int i = 1; i <= N; i++) {
    cin >> M;
    int A;
    for(int j = 0; j < M; j++) {
      cin >> A;
      To.at(i).push_back(A);
    }
  }
  dfs(1, 1);
  if(ans) {
    cout << "Yes" << endl;
  }
  else {
    cout << "No" << endl;
  }
}