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

#ifdef _RUTHEN
#include <debug.hpp>
#else
#define show(...) true
#endif

#define REP(i, n) for (int i = 0; i < (n); i++)
template <class T> using V = vector<T>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int N, M;
    cin >> N >> M;
    V<V<int>> G(1, V<int>(N));
    iota(G[0].begin(), G[0].end(), 0);
    REP(i, M) {
        string S;
        cin >> S;
        V<V<int>> NG;
        for (auto &vec : G) {
            V<int> a0, a1;
            for (auto &i : vec) {
                if (S[i] == '0') {
                    a0.push_back(i);
                } else {
                    a1.push_back(i);
                }
            }
            if (a0.size() > 0) {
                NG.push_back(a0);
            }
            if (a1.size() > 0) {
                NG.push_back(a1);
            }
        }
        G = NG;
    }
    cout << (G.size() == N ? "Yes" : "No") << '\n';
    return 0;
}