#include <bits/stdc++.h>

int ri() {
	int n;
	assert(scanf("%d", &n) == 1);
	return n;
}

int main () {
	int n = ri();
	assert(3 <= n && n <= 20);
	std::pair<int, int> a[10][10];
	for (int i = 1; i <= 9; i++)
		for (int j = 1; j <= 9; j++) a[i][j] = {i, j};
	for (int i = 0; i < n; i++) {
		int x1 = ri();
		int y1 = ri();
		int x2 = ri();
		int y2 = ri();
		assert(1 <= x1 && x2 <= 9 && 1 <= x2 && x2 <= 9);
		assert(1 <= y1 && y1 <= 9 && 1 <= y2 && y2 <= 9);
		if (x1 == x2 && y1 == y2) continue;
		a[x2][y2] = a[x1][y1];
		a[x1][y1] = {-1, -1};
	}
	std::cout << (a[5][8] == std::pair<int,int>{2, 8} && a[4][8] == std::pair<int,int>{3, 9} && a[6][8] == std::pair<int,int>{7, 9} ? "YES" : "NO") << std::endl; 
	return 0;
}