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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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