using System;

using System.Collections.Generic;//this makes the HashSet work

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Working with SETS");

        // below it's declaring two lists

        string[] admin = new string[] {"John","Amy","Joe"};

        string[] finance = new string[] {"Jessica","Claire","Joe","Phil"};

        //below it's declaring two sets, AdminSet and FinanceSet, and giving them values, admin and finance

        HashSet<string>AdminSet = new HashSet<string>(admin);

        HashSet<string>FinanceSet = new HashSet<string>(finance);

        //Outputs the number of Items in the sets AdminSet and FinanceSet

        Console.WriteLine("Count of Data in Admin Set:"+AdminSet.Count);

        Console.WriteLine("Count of Data in Admin Set:"+FinanceSet.Count);

        //Creating a new set to join the sets AdminSet and FinanceSet using the UnionWith function

        HashSet<string>AdmFinSet = new HashSet<string>(AdminSet);

        AdmFinSet.UnionWith(FinanceSet);

        //Creating a new set to find the common item in the sets AdminSet and FinanceSet using the IntersectWith function

        HashSet<string>AdmFinIntsctSet = new HashSet<string>(AdminSet);

        AdmFinIntsctSet.IntersectWith(FinanceSet);

        //It's displaying all the Items in the set AdmFinSet by assigning the value to the variable name, outputing it and repeating for the next value

        Console.WriteLine("The people listed are:");

        foreach (string name in AdmFinSet)

        {

            Console.WriteLine(name);

        }//end of listing AdmFinSet

        //It's displaying the admins in the same way as the block above

        Console.WriteLine("The Administrators are:");

        foreach (string name in AdminSet)

        {

            Console.WriteLine(name);

        }//end of listing admins

        //It's displaying the people working in finance in the same way as the block above

        Console.WriteLine("The people working in Finance are:");

        foreach (string name in FinanceSet)

        {

            Console.WriteLine(name);

        }//end of listing finance

        //It's displaying all the Items in the set AdmFinIntsctSet by assigning the value to the variable name, outputing it and repeating for the next value

        Console.WriteLine("The list of Administrators who also work in Finance is:");

        foreach (string name in AdmFinIntsctSet)

        {

            Console.WriteLine(name);

        }//end of listing AdmFinIntsctSet

    }//end Main function

}// end Program