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1.9.1 Behavior: accessing class hierarchy

allSubclasses
Answer the direct and indirect subclasses of the receiver in a Set


allSuperclasses
Answer all the receiver's superclasses in a collection


subclasses
Answer the direct subclasses of the receiver in a Set


superclass
Answer the receiver's superclass (if any, otherwise answer nil)


withAllSubclasses
Answer a Set containing the receiver together with its direct and indirect subclasses


withAllSuperclasses
Answer the receiver and all of its superclasses in a collection