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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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