#include<iostream>
using namespace std;
int main () {
int a[3000],b[3000],c[3000];
long long int i,j,k,n,m;
cin>>n>>m;
for (i=0;i<n;i++){
    cin>>a[i];
    for(j=0;j<m;j++){
                     cin>>a[j];
                     }
                    {
                         c[j]= a[j] + b[j];
                         }
                         for (j=0;j<m-1;j++){
                             if ((c[j] = 1) && (c[j+1] = 2) || (c[j] = 2) && (c[j+1] >= 1))
{
                             cout<<"NO";

                            return 0;
                             }
                            else    { cout<<"YES";}
                             }
                             }

                             return 0;
                             }