a = 28
b = 39
c = 79
for _ in range(int(input())):
	p,q,r,s = map(int,input().split())
	x = 10*p+q
	y = 10*r+s
	if x == a:
		a = y
	elif x == b:
		b = y
	elif x == c:
		c = y
if (a,b,c) == (58, 48, 68):
	print("YES")
else:
	print("NO")