#include <bits/stdc++.h> using namespace std; #define int long long const int p=998244353; int po(int a,int b) {if(b==0) return 1; if(b==1) return a; if(b%2==0) {int u=po(a,b/2);return (u*1LL*u)%p;} else {int u=po(a,b-1);return (a*1LL*u)%p;}} int inv(int x) {return po(x,p-2);} mt19937 rnd; #define app push_back #define all(x) (x).begin(),(x).end() #ifdef LOCAL #define debug(...) [](auto...a){ ((cout << a << ' '), ...) << endl;}(#__VA_ARGS__, ":", __VA_ARGS__) #define debugv(v) do {cout<< #v <<" : {"; for(int izxc=0;izxc<v.size();++izxc) {cout << v[izxc];if(izxc+1!=v.size()) cout << ","; }cout <<"}"<< endl;} while(0) #else #define debug(...) #define debugv(v) #endif #define lob(a,x) lower_bound(all(a),x) #define upb(a,x) upper_bound(all(a),x) const int maxn=1e5+5; int par[maxn]; int get(int x) { if(par[x]==(-1)) return x; int ans=get(par[x]); par[x]=ans;return ans; } void merg(int x,int y) { x=get(x);y=get(y);if(x!=y) par[x]=y; } int f(string s) { int u=0; for(int i=0;i<s.size();++i) if(s[i]=='1') u+=(1<<i); return u; } bool al[1<<16]; int32_t main() { ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0); int n,m;cin>>n>>m; string s[m];for(int i=0;i<m;++i) {cin>>s[i];} for(int i=0;i<m;++i) {al[(f(s[i]))]=1;} //if(al.size()!=m) {cout<<"No";return 0;;} string t;for(int i=0;i<n;++i) t.app('1'); if(!al[(f(t))]) {cout<<"No";return 0;} t.clear();for(int i=0;i<n;++i) t.app('0'); if(!al[(f(t))]) {cout<<"No";return 0;} for(int i=0;i<m;++i) { for(int j=0;j<=i;++j) { string s1,s2;s1.resize(n);s2.resize(n); for(int k=0;k<n;++k) { //s1[k]='0'+(s[i][k]-'0')^(s[j][k]-'0'); s2[k]='0'+(s[i][k]-'0') & (s[j][k]-'0'); } //if(!al[(f(s1))]) {cout<<"No";return 0;} if(!al[(f(s2))]) {cout<<"No";return 0;} } } cout<<"Yes";return 0; return 0; }