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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 mixin(self):
 """ Add your own custom functions to the Underscore object, ensuring that they're correctly added to the OOP wrapper as well. """

        methods = self.obj
        for i, k in enumerate(methods):
            setattr(underscore, k, methods[k])

        self.makeStatic()
        return self._wrap(self.obj)