import strutils,sequtils
proc input():string=stdin.readLine

let n=input().parseInt
var
    A= @[2,8]
    B= @[3,9]
    C= @[7,9]

for i in 0..<n:
    var
        li=input().split.map(parseInt)
        now= @[li[0],li[1]]
        nex= @[li[2],li[3]]
    if now==A:
        A=nex
    elif now==B:
        B=nex
    elif now==C:
        C=nex

if A== @[5,8] and B== @[4,8] and C== @[6,8]:
    echo "YES"
else:
    echo "NO"