static void Main(string[] args)
{
var arthur = new Participant("Arthur");
var trillian = new Participant("Trillian");
var ford = new Participant("Ford");
var chat = new ChatRoom();
chat.Add(arthur);
chat.Add(trillian);
chat.Add(ford);
ford.Send("Arthur", "Get your towel");
arthur.Send("Trillian", "Trisha McMillan?!");
ford.SendBulk("Forty-two");
}