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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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