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16????????????????????????,???????????????

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1?16?????????8??17????8??????????????????,???????????,?,?(10~16?????)????????????5~6??????7~8??????

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1?17??8?18???8?,????????????????????????,????????????????,?(5~7?)??????????????????????????????????????5~6?????????????????????7~8????;????????7~8?????9???????????,????9????????????????????????????10??????????????????

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1?18???????????8?19?8???????????,????????????,?(5~8????)???????????????????4~6????,?,?6~7???

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