#![allow(non_snake_case, unused_imports)]
use proconio::{fastout, input, marker::*};

#[fastout]
fn main() {
    input! {
        N: usize,
    }

    let mut edges = vec![];

    for i in 0..N {
        input! {
            M: usize,
            A: [Usize1; M],
        }

        for a in A {
            edges.push((i, a));
        }
    }

    let scc = strongly_connected_components(N, &edges);
    let (z, zi) = coordinate_compression(&scc);

    let n = z.len();
    let mut edges_set = std::collections::HashSet::new();
    let mut deg_out = vec![0; n];

    for (u, v) in edges {
        if scc[u] == scc[v] {
            continue;
        }

        edges_set.insert((*zi.get(&scc[u]).unwrap(), *zi.get(&scc[v]).unwrap()));
        deg_out[*zi.get(&scc[u]).unwrap()] += 1;
    }

    let ord = topological_sort(
        n,
        &edges_set.iter().map(|&(u, v)| (u, v)).collect::<Vec<_>>(),
    );

    // eprintln!(
    //     "scc: {}",
    //     scc.iter()
    //         .map(|x| x.to_string())
    //         .collect::<Vec<_>>()
    //         .join(" ")
    // );

    // eprintln!(
    //     "ord: {}",
    //     ord.iter()
    //         .map(|x| x.to_string())
    //         .collect::<Vec<_>>()
    //         .join(" ")
    // );

    for i in 0..n - 1 {
        if deg_out[ord[i]] == 0 {
            println!("No");
            return;
        }
    }

    println!("Yes");
}

fn coordinate_compression<T: std::cmp::Ord + Clone + Copy>(
    values: &[T],
) -> (Vec<T>, std::collections::BTreeMap<T, usize>) {
    let s: std::collections::BTreeSet<T> = values.iter().cloned().collect();
    let z: Vec<T> = s.iter().cloned().collect();
    let zinv: std::collections::BTreeMap<T, usize> =
        z.iter().enumerate().map(|(i, &v)| (v, i)).collect();
    (z, zinv)
}

fn topological_sort(N: usize, E: &[(usize, usize)]) -> Vec<usize> {
    let mut graph = vec![vec![]; N];
    let mut out_degree = vec![0; N];
    let mut ord = vec![];

    for &(u, v) in E {
        graph[v].push(u);
        out_degree[u] += 1;
    }

    for i in 0..N {
        graph[i].sort();
    }

    let mut q = std::collections::VecDeque::new();

    for i in 0..N {
        if out_degree[i] == 0 {
            q.push_back(i);
        }
    }

    while let Some(now) = q.pop_front() {
        ord.push(now);

        for &nxt in graph[now].iter() {
            out_degree[nxt] -= 1;
            if out_degree[nxt] == 0 {
                q.push_back(nxt);
            }
        }
    }

    ord.reverse();
    return ord;
}

fn strongly_connected_components(N: usize, E: &Vec<(usize, usize)>) -> Vec<usize> {
    struct Graph {
        list: Vec<Vec<usize>>,
        seen: Vec<bool>,
        stop: Vec<usize>,
    }

    impl Graph {
        fn dfs(&mut self, now: usize) {
            self.seen[now] = true;

            for &nxt in self.list[now].clone().iter() {
                if self.seen[nxt] {
                    continue;
                }

                self.dfs(nxt);
            }

            self.stop.push(now);
        }
    }

    let mut g = vec![vec![]; N];
    let mut g_inv = vec![vec![]; N];

    for &(u, v) in E.iter() {
        g[u].push(v);
        g_inv[v].push(u);
    }

    let mut G = Graph {
        list: g,
        seen: vec![false; N],
        stop: vec![],
    };

    for i in 0..N {
        if !G.seen[i] {
            G.dfs(i);
        }
    }

    let mut stop = G.stop;
    stop.reverse();

    let mut G_inv = Graph {
        list: g_inv,
        seen: vec![false; N],
        stop: vec![],
    };

    let mut ret = vec![0; N];
    let mut cnt = 0;

    for i in stop {
        if !G_inv.seen[i] {
            G_inv.dfs(i);

            for &v in G_inv.stop.iter() {
                ret[v] = cnt;
            }

            G_inv.stop = vec![];
            cnt += 1;
        }
    }

    return ret;
}