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

int main() {
    int n;
    cin >> n;
    vector<vector<int>> g(n);
    scc_graph sg(n);
    for (int i = 0; i < n; i++) {
        int m;
        cin >> m;
        while (m--) {
            int j;
            cin >> j;
            j--;
            g[i].push_back(j);
            sg.add_edge(i, j);
        }
    }
    vector<vector<int>> list = sg.scc();
    int sz = list.size();
    vector<int> belong(n);
    for (int i = 0; i < sz; i++) {
        for (int v : list[i]) {
            belong[v] = i;
        }
    }
    vector<set<int>> g2(sz);
    for (int i = 0; i < n; i++) {
        for (int j : g[i]) {
            if (belong[i] != belong[j]) {
                g2[belong[i]].insert(belong[j]);
            }
        }
    }
    vector<bool> visit(sz, false);
    int start = belong[0];
    queue<int> q;
    q.push(start);
    visit[start] = true;
    while (!q.empty()) {
        int v = q.front();
        q.pop();
        for (int nv : g2[v]) {
            if (visit[nv]) {
                continue;
            }
            visit[nv] = true;
            q.push(nv);
        }
    }
    for (int i = 0; i < sz; i++) {
        if (!visit[i]) {
            cout << "No" << endl;
            return 0;
        }
    }
    for (int i = 0; i < sz; i++) {
        if (g2[i].size() >= 2) {
            cout << "No" << endl;
            return 0;
        }
    }
    cout << "Yes" << endl;
}