using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    static Random rand = new Random();

    static List<string> allowedChars = new List<string>()

    {

        "S", "C"

    };

    static List<string> cachedStrings = new List<string>();

    static string cachedString;

    public static void Main()

    {

        for(var x = 0; x < 64; x++)

        {

            var str = string.Empty;

            for (var i = 0; i < 4; i++)

                str += allowedChars[rand.Next(0, 2)] + " ";

            if (cachedString != str)

                cachedStrings.Add(str);

            cachedString = str;

        }

        foreach (var st in cachedStrings.Distinct().ToList())

        {

            Console.WriteLine(st.TrimEnd());

            Console.WriteLine();

        }

    }

}