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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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