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 (x1, y1, x2, y2) = readLine()!!.split(" ").map(Integer::parseInt)
        for (i in 0..4 step 2) {
            if (abc[i] == x1 && abc[i+1] == y1) {
                abc[i] = x2
                abc[i+1] = y2
            }
        }
    }

    for (i in 0..5) {
        if (abc[i] != invincible[i]) {
            println("NO")
            return
        }
    }
    println("YES")
}