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2?????

3??????????

4??????

5???51??????

??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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