#include<iostream>
#include<set>
#include<algorithm>
#include<vector>
#include<string>
#include<set>
#include<map>
#include<numeric>
#include<queue>
#include<cmath>
#include<random>
//#include<fstream>

using namespace std;
typedef long long ll;
const ll INF=1LL<<60;
typedef pair<ll,ll> P;
typedef pair<int,P> PP;
const ll MOD=998244353;

int main(){
    int N,M;
    cin>>N;
    cin>>M;
    vector<string> s(M);

    vector<int> S(M);
    for(int i=0;i<M;i++){
        cin>>s[i];

        int num=0;
        for(char c:s[i]){
            num*=2;
            num+=c-'0';
        }
        S[i]=num;
    }

    for(int n0=0;n0<N;n0++){
        for(int n1=0;n1<N;n1++){
            if(n0==n1) continue;
            
            bool flag=false;

            for(int v:S){
                if( ((v>>n0)&1) != ((v>>n1)&1) ){
                    flag=true;
                }
            }

            if(!flag){
                cout<<"No"<<endl;
                return 0;
            }
        }
    }

     cout<<"Yes"<<endl;
    return 0;

}