a = int(input())
b = ["b","2","8"]
c = ["c","3","9"]
d = ["d","7","9"]
i = "b"
j = "c"
k = "d"
for i in range(a):
    e,f,g,h = map(str,input().split())
    if b == [i,e,f]:
        b = [i,g,h]
    elif c == [j,e,f]:
        c = [j,g,h]
    elif d == [k,e,f]:
        d = [k,g,h]
if b == ["b","5","8"] and c == ["c","4","8"] and d == ["d","6","8"]:
    print("YES")
else:
    print("NO")