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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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