import sequtils
proc scanf(formatstr: cstring){.header: "<stdio.h>", varargs.}
proc scan(): int = scanf("%lld\n",addr result)
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"