/*input
4 4
0 1 0 1
1 0 1 0
0 1 0 1
1 0 1 0
*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
int main()
{
    ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
    int T;
    cin >> T;
    while (T--)
    {
        int N;
        cin >> N;
        int A[N][N];
        for (int i = 0; i < N; i++)
            for (int j = 0; j < N; j++)
                cin >> A[i][j];
        bool ok = true;
        for (int i = 1; i < N; i++)
            for (int j = 0; j < N; j++)
                ok &= (A[i][j] != A[i - 1][j]);
        for (int i = 0; i < N; i++)
            for (int j = 1; j < N; j++)
                ok &= (A[i][j] != A[i][j - 1]);
        if (ok)
            cout << "Yes\n";
        else
            cout << "No\n";
    }

}