fun main()
{
    val N = readLine()!!.toInt()

    var abc = arrayOf(2, 8, 3, 9, 7, 9)
    val invincible = arrayOf(5, 8, 4, 8, 6,8)

    for (n in 1..N) {
        val xy: List<Int> = readLine()!!.split(" ").map { it.toInt() }
        for (i in 0..4 step 2) {
            if (abc[i] == xy[0] && abc[i+1] == xy[1]) {
                abc[i] = xy[2]
                abc[i+1] = xy[3]
            }
        }
    }

    if (abc contentEquals invincible) {
        println("YES")
    } else {
        println("NO")
    }
}