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??12?19???? ???????,??,??,???????????????????????10?,??????????????12~15?????;???????,??????0???????????????????????,???

??,???,??????????????????????????????????????????????????????????????,?????????????????????????????????????????????3~4????????????????0??,????,????,???

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??????19-21??,??,????????,????????????????4~6?,??2~4?,???,????????????????????6~8?,???????10???????????????????????????????????4~5??,??6~8????????

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