# -*- coding: utf-8 -*-

import sys
from collections import defaultdict

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
sys.setrecursionlimit(10 ** 9)
INF = 10 ** 18
MOD = 10 ** 9 + 7

N = INT()
D = defaultdict(str)
D[(2, 8)] = 'a'
D[(3, 9)] = 'b'
D[(7, 9)] = 'c'

for i in range(N):
    x1, y1, x2, y2 = MAP()
    if (x1, y1) in D:
        D[(x2, y2)] = D[(x1, y1)]
        del D[(x1, y1)]

if D[(5, 8)] == 'a' and D[(4, 8)] == 'b' and D[(6, 8)] == 'c':
    YES()
else:
    NO()