#include <iostream>
#include <vector>
using namespace std;
int main(void) {
	int n, x1, y1, x2, y2;
	cin >> n;
	vector<pair<int, int> > abc = { {2,8},{3,9},{7,9} };
	for (int i = 0; i < n; ++i) {
		cin >> x1 >> y1 >> x2 >> y2;
		pair<int, int> a = { x1,y1 }, b = { x2,y2 };
		for (int j = 0; j < 3; ++j) {
			if (abc[j] == a) abc[j] = b;
		}
	}
	pair<int, int> a = { 5,8 }, b = { 4,8 }, c = { 6,8 };
	if (abc[0] == a && abc[1] == b && abc[2] == c)
		cout << "YES" << endl;
	else
		cout << "NO" << endl;
	return 0;
}