protected void permutation(int[] all, int[] current, int index)
        {
            if (index >= all.Length)
            {
                MessageBox.Show("Permutation gefunden:" + current.ToString());
            }
            else
            {
                for (int i = 0; i < all.Count(); i++)
                {
                    current[index] = all[i];
                    permutation(all, current, index + 1);
                }
            }
        }

        protected void permutation(int[] all)
        {
            int[] current = new int[all.Length];
            permutation(all, current, 0);
        }