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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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