N = int(input())

lst = [[2,8], [3,9], [7,9]]

for _ in range(N):
    a,b,c,d = map(int, input().split())
    for i in range(3):
        if lst[i] == [a,b]:
            lst[i] = [c,d]
if lst == [[5,8], [4,8], [6,8]]:
    print('YES')
else:
    print('NO')