N = int(input())
list = []
for i in range(N):
    n = input()    
    m = n.split()
    p = [int(i) for i in m]
    list.append(p)
else:
    a = [2, 8]
    b = [3, 9]
    c = [7, 9]
    while len(list) != 0:
        r = list[0]
        q = r[0:2]
        if a == q:
            a = r[2:4]
        elif b == q:
            b = r[2:4]
        elif c == q:
            c = r[2:4]
        else:
            pass
        del list[0]
    else:
        if a == [5, 8] and b == [4, 8] and c == [6, 8]:
            print("YES")
        else:
            print("NO")