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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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