<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def GetNotifications(self, queue):
 """Returns all queue notifications."""

    queue_shard = self.GetNotificationShard(queue)
    return self._GetUnsortedNotifications(queue_shard).values()