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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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