using System;
using System.Collections.Generic;
using System.Collections;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Hashtable hash = new Hashtable(); 
            hash.Add("A", new Hashtable()); 
            ((Hashtable)hash["A"]).Add("A", 1);
            ((Hashtable)hash["A"]).Add("B", 2);
            hash.Add("B", new Hashtable()); 
            ((Hashtable)hash["B"]).Add("A", 4);
            ((Hashtable)hash["B"]).Add("B", 8);

            foreach (string k in ((Hashtable) hash["B"]).Keys)
            {
                Console.WriteLine(k + " - " + ((Hashtable) hash["B"])[k]);
            }
        }
    }
}