import sequtils
proc getchar_unlocked():char {. importc:"getchar_unlocked",header: "<stdio.h>" ,discardable.}
proc scan(): int =
  while true:
    let k = getchar_unlocked()
    if k < '0': return
    result = 10 * result + k.ord - '0'.ord

let n = scan()
proc toI(x,y:int):int = x * 10 + y
var poses = @[toI(2,8),toI(3,9),toI(7,9)]
for _ in 0..<n:
  let a = toI(scan(),scan())
  let b = toI(scan(),scan())
  for i in 0..<3:
    if poses[i] == a:
      poses[i] = b
      break
if poses == @[toI(5,8),toI(4,8),toI(6,8)]: echo "YES"
else: echo "NO"