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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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