n = int(input())
start = [[2,8],[3,9],[7,9]]
for i in range(n):
    xy = list(map(int,input().split()))
    xy1 = xy[:2]
    xy2 = xy[2:]
    if xy1 in start:
        start[start.index(xy1)]=xy2
print("YES") if start==[[5, 8], [4, 8], [6, 8]] else print("NO")