?????3?o???????????????￡é??é?????a??????§????????2????è§?è????′??-é?′????¤§??￥???a??
??????é??????±??1?????o?????????????a??è??????o?èˉ?????2￥?2￥???è′??????-????¤????????1???ˉè??è§?è???¤§??￥???a??
????￥1èˉ?é?3???è???????aè§??§??2￥?2￥??1?o???1?¤′???
?￥1???è??é￠?é??????·??·?????o￠????°??￡°èˉ′é?????a???????ˉè§?è????§???a??
?????????（?D??）
?????￥èˉ??°±?????ˉ?????????èμ·????±??μa????§??2￥?2￥??′??-é?′?????1?1????é?′é?1è??èμ·??￥???
??????±????2￥???è°??????°?o???ˉè°???????
???°?o???ˉ??a??aè?-??·?oo??????
???ˉè°???????????o??§?é????????é?′?????o??￥?????¨???è?¤?????????èˉ??????????????-???????
??¤§?±3é￥-???è????????a?|a?|?¤aèˉ?????o???ˉ?????ˉ???????￥??o???????
??·2??￥??ˉ??a?¤§??￥????????￥??????é?¤??±???è????¤?±???????
?é??????§¨????￥???????èˉ′èˉ??￥???¤?oo??????
???§????ˉ?è??è???????????
???§????ˉ?è??è?????è°???????
?è??è??è????￥é?????èˉ??o?????????-???è??????o¤??￡???
???????a?|a?|???
?±??1??1??¤????é?????é￡???????èˉ???￥??o?§??2￥?2￥??￡??-????oo??ˉ???è?a?·±?????°???????￥1?o?èˉ￥?????o??￥?o?è?a?·±???èo???????
??2￥?2￥????????￥???????°±??ˉè§??o???a?¤§??￥???????????ˉ?????￥???
?§??2￥?2￥??????a??è?￥é￡?è??é?¨a???????1?1????????￥???°??????è§￡é?????a??????????3?¤??o??????ˉ?????¨?¤???oé?¨????????????é????°???????ˉ1??1è?¤??o?o???????èo???????????????￥é????????????1???ˉ???????2????a?|a?|a??
?￥1?2?????????¨???é????°???éo???|????1??2???1????ˉ1??1?????????èo???????
??¤§?±3é￥-?????oè??????1???ˉ????o??????oé?¨é??è??é????°?2?????o????
??????????è·3??????è????￥??oa?|a?|???
???μ??μ?????a???????2????????¤???3???????-￡????2?????????????????2￥?2￥???