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Eek! Multiple inheritance is not implemented in most programming languages for good reason. In general it is wise to favor composition over inheritance.

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It is deciding between "IS A" and "HAS A".

In general, there is no such a rule that says: "HAS A" is wiser. It depends on the use case.

Related, an interesting article: IS-A IS-A HAS-A

http://weblog.raganwald.com/2008/03/is-is-has.html

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