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So now, I would like for you to tell me

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which of the following can be considered bad smells in

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the context of refactoring. The fact that the program takes

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too long to execute? The fact that method M in class

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C is very long? Or the, the fact that Class

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Cat and Dog are subclasses of class Animal? Or finally the

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fact that every time we modify method M1 we also

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need to modify method M2? So please mark all that apply.