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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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