#include<stdio.h>
void run(int n)
{
	int a[105][105],i,j;
	for(i=0;i<n;i++)
		for(j=0;j<n;j++)
			scanf("%d",&a[i][j]);
	for(i=0;i<n;i++)
		for(j=0;j<n;j++)
			if(a[i][j]!=a[j][i])
			{
				printf("No!\n");
				return;
			}
	printf("Yes!\n");
}
int main()
{
	int n;
	scanf("%d",&n);
	while(n!=0)
	{
		run(n);
		n=0;
		scanf("%d",&n);
	}
}

/**************************************************************
	Problem: 2217
	User: admin
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:1144 kb
****************************************************************/