src/dfcx_scrapi/builders/flows.py [417:441]:
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        self._check_proto_obj_attr_exist()

        if event_handlers and event_names:
            raise UserWarning(
                "Only one of the `event_handlers` and "
                "`event_names` should be specified."
            )
        if event_handlers:
            new_ehs = self._find_unmatched_event_handlers(event_handlers)
        elif event_names:
            new_ehs = self._find_unmatched_event_handlers_by_name(event_names)
        else:
            raise UserWarning(
                "At least one of the `event_handlers` and "
                "`event_names` should be specified."
            )

        self.proto_obj.event_handlers = new_ehs

        return self.proto_obj


    def remove_transition_route_group(
        self,
        transition_route_groups: Union[str, List[str]]
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src/dfcx_scrapi/builders/pages.py [518:542]:
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        self._check_proto_obj_attr_exist()

        if event_handlers and event_names:
            raise UserWarning(
                "Only one of the `event_handlers` and "
                "`event_names` should be specified."
            )
        if event_handlers:
            new_ehs = self._find_unmatched_event_handlers(event_handlers)
        elif event_names:
            new_ehs = self._find_unmatched_event_handlers_by_name(event_names)
        else:
            raise UserWarning(
                "At least one of the `event_handlers` and "
                "`event_names` should be specified."
            )

        self.proto_obj.event_handlers = new_ehs

        return self.proto_obj


    def remove_transition_route_group(
        self,
        transition_route_groups: Union[str, List[str]]
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