#include <bits/stdc++.h>
using namespace std;
void solve() {
  int n;
  cin >> n;
  bool a[n][n];
  for (int i = 0; i < n; i++) {
    string s;
    cin >> s;
    for (int j = 0; j < n; j++) {
      if (s[j] == '1')
        a[i][j] = true;
      else
        a[i][j] = false;
    }
  }
  bool error = false;
  for (int i = 0; i < n - 1; i++) {
    for (int j = 0; j < n - 1; j++) {
      if (a[i][j]) {
        if (!a[i + 1][j] && !a[i][j + 1]) error = true;
      }
    }
  }
  if (!error)
    cout << "YES\n";
  else
    cout << "NO\n";
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int t;
  cin >> t;
  for (int i = 0; i < t; i++) solve();
  return 0;
}
