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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 _get_queue(self):
 """Gets the actual location of the queue, or None. """

        if self._queue is None:
            self._links = []
            queue, depth = self._resolve_queue(self.queue, links=self._links)
            if queue is None and depth > 0:
                raise QueueLinkBroken
            self._queue = queue
        return self._queue