3 public abstract class CB<T> : CA<T>, IA<T>
7 public abstract class CA<T> : IA<T>
9 public abstract IA<T> Backwards ();
11 IB<T> IB<T>.Backwards () { return null; }
14 public interface IA<T> : IB<T>
16 new IA<T> Backwards ();
19 public interface IB<T>
26 public static void Main ()