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- The queue is: -1
- The queue is: -1 0
- The queue is: -1 0 1 5
- -1 dequeued
- The queue is: 0 1 5
- 0 dequeued
- The queue is: 1 5
- 1 dequeued
- The queue is: 5
- 5 dequeued
- empty queue
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