using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.CompilerServices;
//using System.Web.UI;
using Debug = System.Diagnostics.Debug;
// using System.Drawing.Primitives;
//using System.Drawing;
using System.Windows;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            new Solver().Solve();
        }
    }

    class Solver
    {
        public const double inf = double.PositiveInfinity;
        readonly TextWriter error = Console.Error;

        private void Rep(int n_, Action<int> action)
        {
            for (int i = 0; i < n_; i++)
            {
                action(i);
            }
        }

        public string ReadLine()
        {
            return Console.ReadLine();
        }

        public int Stoi(string s)
        {
            return int.Parse(s);
        }

        int n;

        public void Solve()
        { 
            n = int.Parse(ReadLine());
            var x = new int[n, 3];
            var y = new int[n, 3];

            Rep(n, (i) =>
            {
                var a = ReadLine().Split(' ').Select(s => Stoi(s)).ToArray();
                //Rep(2, (j) =>
                //{
                //    x[i, 1 + j] = a[2 * j];
                //    y[i, 1 + j + 1] = a[2 * j];
                //});
                x[i, 1] = a[0];
                y[i, 1] = a[1];
                x[i, 2] = a[2];
                y[i, 2] = a[3];
            });

            var cur = new int[10, 10];
            cur[2, 8] = 1;
            cur[3, 9] = 2;
            cur[7, 9] = 3;

            Rep(n, (i) =>
            {
                cur[x[i, 2], y[i, 2]] = cur[x[i, 1], y[i, 1]];
                cur[x[i, 1], y[i, 1]] = 0;
            });
            bool ok = false;
            if (cur[5, 8] == 1 && 
                cur[4, 8] == 2 && 
                cur[6, 8] == 3) ok = true;
            Console.WriteLine(ok ? "YES" : "NO");
        }
    }
}