static void Main(string[] args) { E e = new E(); IA a = e; a.ia(); e.ve1(); e.ve2(); e.e3(); F f = new F(); a = f; IB b = f; IC c = f; ID d = f; a.ia(); b.ib(); c.ic(); d.id1(); d.id2(); f.ve1(); f.ve2(); f.vf(); System.Environment.Exit(0); }