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4???????

5????????

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????????,15??17????,????????????????????????,????????,16???????????????????????,??

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1????15??8?????16??8?,?????????????????????????????????,??????????,?(5~6?)?????????????????????????????????????????????????????????????????????????????5~6?????????7~8????????

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1??16????8?17???????????????????8???????????,?????????????,????,?(10~15??)??????????????????????????????????????????????????4~6??

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1?17??8????18??????8????,??????????????????????????????????????????????????????????????6~7??

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