using System;

using System.Collections.Generic;

using System.Linq;

​

namespace Union

{

    public class Program

    {

        public static void Main(string[] args)

        {

            var days1 = new List<string> { "Monday", "Tuesday", "Wednesday", "Thursday","Friday"};

            var days2 = new List<string> { "Monday", "Tuesday", "Wednesday", "Thursday", "Sunday", "Saturday" };

​

            var result = days1.Union(days2);

​

            foreach (var item in result)

            {

                Console.WriteLine(item);

            }

​

            Console.ReadLine();

        }

    }

}