def apply_strategy(self):
        """ Apply deduplication with the configured strategy.

        Transform strategy keyword into its method ID, and call it.
        """
        method_id = self.conf.strategy.replace('-', '_')
        if not hasattr(DuplicateSet, method_id):
            raise NotImplementedError(
                "DuplicateSet.{}() method.".format(method_id))
        return getattr(self, method_id)()
Apply deduplication with the configured strategy.

        Transform strategy keyword into its method ID, and call it.