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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def settable(self):
 """return the subset of those options that are settable at any time. Settable options are in `versatile_options()`, but the list might be incomplete. """

        return CMAOptions([i for i in list(self.items())
                                if i[0] in CMAOptions.versatile_options()])