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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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