#include <iostream>
#include <vector>
#include <set>
#include "atcoder/scc"
#include "atcoder/internal_type_traits"

using namespace std;
using namespace atcoder;

int main() {
    int n;
    cin >> n;
    vector<vector<int>> a(n);
    for (int i = 0; i < n; ++i) {
        int m;
        cin >> m;
        a[i].resize(m);
        for (int j = 0; j < m; ++j) {
            cin >> a[i][j];
            a[i][j]--; // Usize1に相当する処理
        }
    }

    scc_graph scc(n);
    for (int i = 0; i < n; ++i) {
        for (int j : a[i]) {
            scc.add_edge(i, j);
        }
    }

    auto groups = scc.scc();
    vector<int> labels(n);
    for (int i = 0; i < groups.size(); ++i) {
        for (int v : groups[i]) {
            labels[v] = i;
        }
    }

    int m = groups.size();
    vector<set<int>> g(m);
    for (int i = 0; i < n; ++i) {
        for (int j : a[i]) {
            if (labels[i] != labels[j]) {
                g[labels[i]].insert(labels[j]);
            }
        }
    }

    int crr = 0;
    while (g[crr].find(crr + 1) != g[crr].end()) {
        crr = *g[crr].find(crr + 1);
    }
    bool ans = (crr == m - 1);

    cout << (ans ? "Yes" : "No") << endl;

    return 0;
}