N = int(input())
ls = [[2, 8], [3, 9], [7, 9]]

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