using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

         HashSet<string> pendingManualReviewOppsVisits = new ();

        pendingManualReviewOppsVisits.Add("asb");

        if(pendingManualReviewOppsVisits.Contains("ab"))

           {

                Console.WriteLine("Hello World");

           }

    }

}