human
Solve the following python programming problem given the following code:
@ defer.inlineCallbacks 
def filter_events_for_clients(self, user_tuples, events, event_id_to_state) : 
    ' Returns dict of user_id -> list of events that user is allowed to
        see.

        :param (str, bool) user_tuples: (user id, is_peeking) for each
            user to be checked. is_peeking should be true if:
              * the user is not currently a member of the room, and:
              * the user has not been a member of the room since the given
                events
        ' 
    forgotten = (yield defer.gatherResults ([self.store.who_forgot_in_room (room_id) for room_id in frozenset ((e.room_id for e in event))], consumeErrors = True)) 
    event_id_forgotten = frozenset ((row ['event_id'] for rows in forgotten for row in rows)) 
    def allowed(event, user_id, is_peeking) : 
        state = event_id_to_state [event.event_id] 
        visibility_event = state.get ((EventTypes.RoomHistoryVisibility, ''), None) 
        if visibility_event : 
            visibility = visibility_event.content.get ('history_visibility', 'shared') 
else : 
            visibility = 'shared' 
if (visibility not in VISIBILITY_PRIORITY) : 
            visibility = 'shared' 
if (visibility == 'world_readable') : 
            return True 
if (event.type == EventTypes.RoomHistoryVisibility) : 
            prev_content = event.unsigned.get ('prev_content', { 
                
}) 
            prev_visibility = prev_content.get ('history_visibility', None) 
            if (prev_visibility not in VISIBILITY_PRIORITY) : 
                prev_visibility = 'shared' 
new_priority = VISIBILITY_PRIORITY.index (visibility) 
            old_priority = VISIBILITY_PRIORITY.index (prev_visibility) 
            if (old_priority < new_priority) : 
                visibility = prev_visibility 
membership_event = state.get ((EventTypes.Member, user_id), None) 
        if membership_event : 
            if (membership_event.event_id in event_id_forgotten) : 
                membership = None 
else : 
                membership =...

    
    

    Fix the buggy line: forgotten = (yield defer.gatherResults ([self.store.who_forgot_in_room (room_id) for room_id in frozenset ((e.room_id for e in event))], consumeErrors = True))
assistant
#Here is Python code to fix the buggy line: forgotten = (yield defer.

forgotten = (yield defer.gatherResults ([self.store.who_forgot_in_room (room_id) for room_id in frozenset ((e.room_id for e in events))], consumeErrors = True))