#include<bits/stdc++.h>
#include<atcoder/scc>
using namespace std;
using ll=long long;
#define rep(i,s,t) for(ll i=s;i<(ll)(t);i++)
#define rrep(i,s,t) for(ll i=(ll)(t)-1;i>=(ll)s;i--)
#define all(x) begin(x),end(x)
#define rall(x) rbegin(x),rend(x)

#define TT template<typename T>
TT using vec=vector<T>;
TT bool chmin(T &x,T y){return x>y?(x=y,true):false;}
TT bool chmax(T &x,T y){return x<y?(x=y,true):false;}

struct io_setup{
    io_setup(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
        cout<<fixed<<setprecision(15);
    }
} io_setup;

int main(){
    int N;
    cin>>N;
    atcoder::scc_graph G(N);
    vector<vector<int>>to(N);
    for(int i=0;i<N;i++){
        int m;
        cin>>m;
        for(int j=0;j<m;j++){
            int a;
            cin>>a;
            a--;
            G.add_edge(i,a);
            to[i].push_back(a);
        }
    }
    vector<vector<int>>S=G.scc();
    vector<int>id(N);
    int L=S.size();
    for(int i=0;i<L;i++){
        for(auto x:S[i]){
            id[x]=i;
        }
    }
    vector<vector<int>>g(L);
    for(int i=0;i<N;i++){
        for(auto j:to[i]){
            if(id[i]!=id[j])g[id[i]].push_back(id[j]);
        }
    }
    vector<bool>flag(L);
    flag[id[0]]=true;
    queue<int>q;
    q.push(id[0]);
    vector<int>dp(L,-(1<<30));
    dp[id[0]]=1;
    while(q.size()){
        int x=q.front();
        q.pop();
        for(auto i:g[x]){
            if(!flag[i]){
                flag[i]=true;
                chmax(dp[i],dp[x]+1);
                q.push(i);
            }
        }
    }
    int ma=0;
    for(int i=0;i<L;i++)chmax(ma,dp[i]);
    if(ma==L)cout<<"Yes\n";
    else cout<<"No\n";
}