using System;

using System.Collections.Generic;

using System.Linq;

using Combinatorics.Collections;

public class Program

{

    public static void Main()

    {

        var integers = new List<string> {"abc", "def", "ghi", "jkl", "ghi"};

​

            var c = new Combinations<string>(integers, 3, GenerateOption.WithoutRepetition);

​

            foreach (var v in c)

            {

                Console.WriteLine(string.Join(",", v));

            }

​

    }

}