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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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