using System.Collections.Generic;
public class HelloWorld {
public static void Main() {
Request request = new Request();
HashSet<string> originalWeekDays = new HashSet<string>(request.weekDays);
originalWeekDays.Remove("Sat");
Console.WriteLine(String.Join(", ", originalWeekDays));
Console.WriteLine(String.Join(", ", request.weekDays));
public string[] weekDays = new string[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };