#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  scc_graph g(n);
  VVI to(n);
  rep(i, n) {
    int m;
    cin >> m;
    rep(_, m) {
      int a;
      cin >> a;
      a--;
      g.add_edge(i, a);
      to[i].emplace_back(a);
    }
  }
  auto scc = g.scc();
  int sz = scc.size();
  VI cls(n);
  rep(i, sz) for (int v : scc[i]) cls[v] = i;
  bool ans = true;
  rep(i, sz - 1) {
    bool found = false;
    for (int u : scc[i]) for (int v : to[u]) if (cls[v] == i + 1) {
      found = true;
    }
    if (!found) {
      ans = false;
      break;
    }
  }
  ans &= cls[0] == 0;
  cout << (ans ? "Yes\n" : "No\n");
}