def METHOD_NAME(
    self, event_type: Optional[CBEventType] = None
) -> List[List[CBEvent]]:
    """Pair events by ID, either all events or a sepcific type."""
    if event_type is not None:
        return self._get_event_pairs(self._event_pairs_by_type[event_type])
    return self._get_event_pairs(self._sequential_events)