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2???50?????

3?????????

4?????????

5???????100???

???12????2?????????????????????????????? ??????????,??????,?????

????:??(ABC)???????????

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??????????????11??30?,???11?????????,???????12???????????????1?2???,???????????????,??????4??????????????????????????????,?????????????????????????,??

?????????,?????,??????????,??????,????????11??29??????30???,??200???

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