#include <cstdlib>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <iostream>
#include <sstream>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <fstream>
#include <numeric>
#include <iomanip>
#include <bitset>
#include <list>
#include <stdexcept>
#include <functional>
#include <utility>
#include <ctime>
#include <random>
#include <cassert>
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
#define MEM(a,b) memset((a),(b),sizeof(a))
const LL INF = 1e9 + 7;
const int N = 2e2 + 10;
int a[N][N];
int main()
{
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    int ncase;
    cin >> ncase;
    while (ncase--)
    {
        int n;
        cin >> n;
        int flag = 1;
        for (int i = 1; i <= n; i++)
        {
            for (int j = 1; j <= n; j++)
            {
                cin >> a[i][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 (flag) puts("Yes");
        else puts("No");
    }
    return 0;
}