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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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