THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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One of the primary differences I noted was that the Geromino classes containeed contained additional methods such add add(int), subtract(int), and things like that. I find this similar to Henri's suggestion that MutableString contain StringUtils-like methods (split(), capitalize(), etc).
Another difference was the existence of a Mutable interface I (hen) think.
4) List of classes to have mutable versions of
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