#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
using namespace std;

int a[110][110];

int main() {
    int T;
    scanf("%d",&T);
    for (; T--;) {
        int n;
        scanf("%d",&n);
        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= n; j++)
                scanf("%d",&a[i][j]);
        bool flag = 1;
        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= n; j++) {
                if (i != 1 && a[i][j] == a[i - 1][j])
                    flag = 0;
                if (j != 1 && a[i][j] == a[i][j - 1])
                    flag = 0;
                if (i != n && a[i][j] == a[i + 1][j])
                    flag = 0;
                if (j != n && a[i][j] == a[i][j + 1])
                    flag = 0;
            }
        if (flag)
            puts("Yes");
        else
            puts("No");
    }
    return 0;
}