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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 _connect_broker(self):
 """ Establish a reference to the Broker, Router and parent context used for connections. """

        if not self.broker:
            self.broker = mitogen.master.Broker()
            self.router, self.parent = mitogen.unix.connect(
                path=ansible_mitogen.process.MuxProcess.unix_listener_path,
                broker=self.broker,
            )