<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def features(self):
 """ The set of features supported by this MUC. This may vary depending on features exported by the MUC service, so be sure to check this for each individual MUC. """


        return {
            aioxmpp.im.conversation.ConversationFeature.BAN,
            aioxmpp.im.conversation.ConversationFeature.BAN_WITH_KICK,
            aioxmpp.im.conversation.ConversationFeature.KICK,
            aioxmpp.im.conversation.ConversationFeature.SEND_MESSAGE,
            aioxmpp.im.conversation.ConversationFeature.SEND_MESSAGE_TRACKED,
            aioxmpp.im.conversation.ConversationFeature.SET_TOPIC,
            aioxmpp.im.conversation.ConversationFeature.SET_NICK,
            aioxmpp.im.conversation.ConversationFeature.INVITE,
            aioxmpp.im.conversation.ConversationFeature.INVITE_DIRECT,
        }