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20??????21???????,??????,?????????????????????????????????4~6?,??2~4?,?????,???????????????????????6~8??

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12?????20????8?21??8???????,??????????????????????????????????????????????????????????????????????????????????????4~6???????????,??????7~8???

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12??????????????21????????????????8??????22??????8?,???????????????????????????,?,??????????????,?????(10~13????)??????????????????????????????????????4~5??;????????????????????????????????????????????7~8???????????????????????9~10?????

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12?22?????8?23??????8?,???????????????????????????????????????????????????????????????????????????????????????4~5????;????????????????????????????????7~8?????????????9~10??????????????

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