N = int(input())

A = 28
B = 39
C = 79

d = [28, 39, 79]

for i in range(N):
    x1, y1, x2, y2 = map(int, input().split())
    for i, v in enumerate(d):
        if v == x1 * 10 + y1:
            d[i] = x2 * 10 + y2
            break

if d == [58, 48, 68]:
    print("YES")
else:
    print("NO")