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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??????8????,??????????,??????????;????????????????????????,???????????7??????,??????????

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