// compile: g++ -o data data.cpp -O3 -std=gnu++20 -Wall -Wextra -Wshadow -D_GLIBCXX_ASSERTIONS -ggdb3 -fmax-errors=2 -DLOCAL
// run: ./data < data.in
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#ifdef LOCAL
#include <debug/codeforces.h>
#define debug(x...) {_variables(#x);_print(x);}
#else
#define debug(x...)
#endif
template<typename...Args> void print_(Args...args){((cout<<args<<" "),...)<<endl;}
#define rep(i,a,b) for(int i=(a);i<(int)(b);++i)
#define sz(v) ((int)(v).size())
#define print(...) print_(__VA_ARGS__);
#define INTINF (int)(9223372036854775807)
#define int long long
#define MAXN 110 

bool vis[MAXN][MAXN];

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

    int n, m; cin >> n >> m;
    rep(i, 0, m) {
        int k; cin >> k;
        vector<int> a(k);
        rep(j, 0, k) cin >> a[j], --a[j];
        rep(x, 0, k) rep(y, 0, k) vis[a[x]][a[y]] = 1;
    }
    rep(i, 0, n) rep(j, 0, n) if (i!=j && !vis[i][j]) {
        cout << "No" << endl;
        return 0;
    }
    cout << "Yes" << endl;

    return 0;
}