#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll = long long;
int N;
vector<vector<int>> G;

void solve(){
    scc_graph SCC(N);
    for(int i = 0;i<N;i++){
        for(int j = 0;j<G[i].size();j++){
            SCC.add_edge(i,G[i][j]);
        }
    }
    auto vv = SCC.scc();
    bool flg = true;
    for(int i = 0;i<vv.size()-1;i++){
        sort(vv[i].begin(),vv[i].end());
        sort(vv[i+1].begin(),vv[i+1].end());
        bool is = false;
        for(int j = 0;j<vv[i].size();j++){
            for(auto &to:G[vv[i][j]]){
                if(binary_search(vv[i+1].begin(),vv[i+1].end(),to)){
                    is = true;
                    break;
                }
            }
        }
        if(is==false){
            flg = false;
            break;
        }
    }
    if(flg){
        cout<<"Yes"<<endl;
    }
    else{
        cout<<"No"<<endl;
    }
}

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> N;
    G.resize(N);
    for(int i = 0;i<N;i++){
        int m;
        cin >> m;
        G[i].resize(m);
        for(int j = 0;j<m;j++){
            cin >> G[i][j];
            G[i][j]--;
        }
    }
    solve();
}