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????,16?????17????,?????????????????????????????4~6?,?8???,2??16????8????17????8?????,???????????????????????????????????????????????5~6??????7~8??;???????????????????????????????????7????8?????????2????16??????6?????

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2??????16???????8??17?8?????????????????,????????????????????????????????????????????,?,??????????????????????,??(5~9??)???????????????????,????,??????????????????????????????????????????????????????????????4~6?????????????????????????????????????????5~7??

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2????17????8?18???????8????????????,??????????????????????????????????,???,?????,??????????????(5~7?)???????????????????????????????????????????????????????,????????????,????????????4~5??;??????????????????????????5~7??

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2?????18???8??????19?8????????????,?????????????????????????????????????????????????????????,?????,????????????????????????????????????????????????,??,??????????????????,?(25~40??????????????????)???????????????????????????4~5?;?????????????????????5~7???????????????

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