Combinations without Repetition

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp4
{
    class Program
    {
        static char[] elements;
        static char[] vari;
        static int set;

        public static void Comb(int index, int start)
        {
            if (index >= set)
            {
                Console.WriteLine(string.Join(" ", vari));
            }

            else
            {
                for (int i = start; i < elements.Length; i++)
                {
                    vari[index] = elements[i];

                    Comb(index + 1, i + 1);
                }
            }
        }

        static void Main(string[] args)
        {
            elements = Console.ReadLine().Split().Select(char.Parse).ToArray();
            set = int.Parse(Console.ReadLine());

            vari = new char[set];

            Comb(0, 0);
        }
    }
}