static void MultiMapTest()
        {
            MultiMap <char, int> map = new MultiMap <char, int>();

            Random rand = new Random();

            for (int i = 0; i < 25; i++)
            {
                char key = (char)rand.Next(65, 71);
                map.add(key, rand.Next(0, 50));
            }

            map.print();

            Console.WriteLine();
            Console.WriteLine();
            Console.WriteLine();

            int[] items = map.get('A');

            for (int i = 0; i < items.Length; i++)
            {
                Console.WriteLine(items[i]);
            }
        }