#include <bits/stdc++.h>
using namespace std;
using ll = long long;
bool solve() {
	int a;
	cin >> a;
	bool cat = true;
	for (int i = 0; i < a; i++) {
	  string x1, x2, x3, x4, x5;
	  cin >>x1>>x2>>x3>>x4>>x5;
	  if (x1==x3 && x2==x4 && x4==x5 && x1!=x2) {
	    continue;
	  }
	  else {
	    cat = false;
	  }
	}
	return cat;
}
int main() {
	int t;
	cin >> t;
	while (t--) {
		if (solve()) cout << "Yes" << endl;
		else cout << "No" << endl;
	}
}