l=[["A",[2,8]],["B",[3,9]],["C",[7,9]]]
ans_l=[["A",[5,8]],["B",[4,8]],["C",[6,8]]]
n=int(input())
for i in range(n):
    s=list(map(int,input().split()))
    t,u=[s[0],s[1]],[s[2],s[3]]
    for j in range(3):
        # print(l[j][1],t)
        if l[j][1]==t:l[j][1]=u
print("YES" if l==ans_l else "NO")