using System;

using System.Collections.Generic;

using System.Linq;              

public class Program

{

    public static void Main()

    {

        var arry1 = new string[]{"One", "Two", "Three", "One"};

        var arry2 = arry1.Distinct();

        foreach(var a in arry2){

            Console.WriteLine(a);

        }

    }

}