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2?????500

3???????????

4???????????

5??????????

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6?????????????8????????????????,??????,??????????????

?????,??6~8?,???10???????;??4~6?,??7~8?,???10??????8????,???0???????????,???8~10?,?????12????????

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6?????7????,??,????????????????????????????????????????????????????,6????????????????7??????,???,??????????;??????????????

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