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????????2????7??????? ?????,??????(2???6??????????),?,????????????????6~8????,????????????????9~13?;????????????????????????????????????????????????????8???????8?????,?????????????????????????????6~8?????????,????12~16?????????????????,???

???????????(7?????8??????),??,????????6~8???,???????????????10??????;?????4~6?,??????????????????????????????8~10?,????????????????10????

??,7??,?????5~6?????7~8???????????,????????????????,???????????????????9~10???;?????????????????????????????????????9????????????10~11??8???????????????????,??,???

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7??,??????,?????????????????

?????????,7???????????????8????,?????????????????????,??????????;???????????????,?????????7??????,???????????????????????????

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