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(" ")
        for (i in 0..4 step 2) {
            if (abc[i] == x1[0] && abc[i+1] == y1[0]) {
                abc[i] = x2[0]
                abc[i+1] = y2[0]
            }
        }
    }

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