2：1

Send 2 high priority packets, then 1 low priority packet

3：1

Send 3 high priority packets, then 1 low priority packet

4：1

Send 4 high priority packets, then 1 low priority packet

5：1

Send 5 high priority packets, then 1 low priority packet

6：1

Send 6 high priority packets, then 1 low priority packet

7：1

Send 7 high priority packets, then 1 low priority packet

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