using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        int[] firstSet = { 1, 2, 3, 4, 5, 5 };

        int[] secondSet = { 3, 4, 5, 6, 7 };

​

        // Performing Union using query syntax

        var combinedNumbers1 = (from num in firstSet

                               select num)

                               .Union(

                               from num in secondSet

                               select num);

​

        // Performing Union using method syntax

        var combinedNumbers2 = firstSet.Union(secondSet);

        Console.WriteLine("Combined unique numbers:");

        foreach (var num in combinedNumbers1) // Try also with combinedNumbers2

        {

            Console.Write(num + ", ");

        }

    }

}