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??????????12??21???? ????????????,21?,??,???????????4~8?;?????????????????????????????2~4????????,????????,?,??

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????12???21?08?:?,12??21????????08?22?????08???,??????????????????????????????????????????????5~6??????????7~8??;????????????????????????7~8????????????????????9~10???,??????????9?????????????????????????????10~11???

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????????,21????????????22??,????;?????????????????????????

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12????21?08???????????????????22????08????,????????????????????????,?,?????????(3~9????)????????????????????????????????????????????5~6??,???????????7~8??????;?????6~8????,?????9~10????

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12????????22????????????08????23???????????08?????????,?????????????????????????????,????,??(3~6?????????)??????????????????????????????????5~6??,?7~8????;???????6~8????????,????9~10??