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[API 2006]	Method `clone()`
[Bloch 2008]	Item 39. Make defensive copies when needed, Item 11. Override clone judiciously
[Security 2006]

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OBJ03-J. Do not mix generic with nongeneric raw types in new code Image Added 04. Object Orientation (OBJ) OBJ05-J. Defensively copy private mutable class members before returning their references