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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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