#include<iostream> using namespace std; #define max_len 101 int arr[max_len][max_len]; bool sym_matrix(int arr[max_len][max_len],int n) { bool c = true; for(int i = 0;i < n;i++) for(int j = i;j < n;j++) if(arr[i][j] != arr[j][i]) { c = false; break; } return c; } int main(void) { int n; while(cin >> n) { for(int i = 0;i < n;i++) for(int j = 0;j < n;j++) cin >> arr[i][j]; if(sym_matrix(arr, n)) cout << "Yes!" << endl; else cout << "No!" << endl; } return 0; }