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The class diagram provided has an error in it; the Lotus class depicted as extending Flower should actually be named (and return) "Lily". The provided code correctly has a Lily class instead of a Lotus class.
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Covariant Return Types
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The class diagram provided has an error in it; the Lotus class depicted as extending Flower should actually be named (and return) "Lily". The provided code correctly has a Lily class instead of a Lotus class.