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2?


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2???????1015?
3??????????????1015?
4?20???????
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[ ] ??,?.(20)
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6,?????,???.????????.
[ ?] ????...

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1 ?????????????????????????????????K?????
11 ????????????????????
12???
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?69g2???
2?????????????????????????????????????????
21???????????????
22????
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??9g()? 60g???
3 ???????????????(????)?????????????????????
...