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?12??????????19??????6??:?????????????,12?19?????8?????20????8?????????,??????????????????5~6?????7~8????????,?,???????????????????6~7??????8~10??;??????????????????????7~8??????????????????????????9??,??????9???????10~11???

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12??????19????????8?20????8??,???????????????????????????????????????????????????????????????????????????????????4~6?,????,???????????7????;??????????????????????????????????????????????7~8???????9??????

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12??20?8????21?8?????????????,??????????????????????????????????????????????,?,??(5~8?)??????????????????????????????????4~6???????????;?????????????????7~8??

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12??21??????8???????????????????22???8?,?????????????????????????????????????????????????,????,????????(5~9??)??????????????????????????

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