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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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