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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def subscribe_to_quorum_channel(self):
 """In case the experiment enforces a quorum, listen for notifications before creating Partipant objects. """

        from dallinger.experiment_server.sockets import chat_backend

        self.log("Bot subscribing to quorum channel.")
        chat_backend.subscribe(self, "quorum")