#include<bits/stdc++.h>
using namespace std;
const int N = 110;
int ma[N][N]; 
bool flag;
int main(){
    int n;
    while(cin>>n){
        flag = true;
        memset(ma,0,sizeof(ma));
        for(int i = 1;i<=n;i++){
            for(int j = 1;j<=n;j++){
                cin>>ma[i][j];
        }
    }
        for(int i = 1;i<=n;i++){
            for(int j = 1;j<=i;j++){
                if(ma[i][j]!=ma[j][i]){
                    flag  = false;
                    break;
                }
            }
        }
        if(flag){
            cout<<"Yes!";
        }else{
            cout<<"No!";
        }
        cout<<"\n";
    }
return 0;
}