using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

         var data = new List<string>() { "One", "Two", "Three", "One", "One", "Four" };

         for (int i = 0; i < data.Count; i++)

         {

            if (data[i] == "One")

            {

                data.RemoveAt(i--);

            }

         }

        Console.WriteLine(String.Join(",", data));

    }

}