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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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16????17??,?????????????????????????????????,????,?????????????,?????,??????????????,???????

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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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