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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 get_bundle_registered_services(self, bundle):
 # type: (Any) -> List[ServiceReference] """ Retrieves the services registered by the given bundle. Returns None if the bundle didn't register any service. :param bundle: The bundle to look into :return: The references to the services registered by the bundle """

        with self.__svc_lock:
            return sorted(self.__bundle_svc.get(bundle, []))