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???? ????1500??????????????10??????????????????????3????????????????4?5?????????????????????
????? ?????????????15?????30??????????????????500????15??????????1????5?7????????????????????????????????????
????? ?????????????????????????????????????2?3??????????????????
????? ???24????30?????????????12????20????15????6????????9?????5?????????????????? ?????????????????????????????????????????????????????????????????????????????????????
??? ?????????????150???????????????100?????250????????????????????60?????????????????
???? ????????????30?60?????15?24????30??3????????3??????????????????????????
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