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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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