?e?£??¤?oo???ea???°?1′e???oo??????????°?????¨??ˉ??¤????o????
????oo?????¢e?e????????e?£?£μ?¤§????????e?a????o??????a????¨?????????1?????-???e??e????e?£?1′e???oo?o¤??????
a???°???????e????????????????ˉe??e???????????e′μ????????????e????°?o????????????????e¢-????????3eˉ·e???¤??????¨?????o???????????μ????±??????????oo???a??
e??e?eˉ′????1????????1??2??????????¨??¨???e????ˉe???-??ˉ1??1????-????
e??????1???-??????e£??????????????-£?????¨??e?????e?ˉ?o??????????e£??ˉ1e???¤?????????????????e?3???e????????e???ooeˉ′eˉ????????????????e????°??????e?£?1????????¤±??????e???¤???o??????e???2???????e?¨??????ˉ1?¤?e?¢??????eˉ??μ??????ae§?????????ˉ??????????????°???eˉ??1???????e?¨???a???????????????1?????¨???
a?????e£?????????¨e??e???????????????¤???????????????ˉ??¥?????????eˉ′eˉ???????a???????????e??e?????e??e?????
a????ˉ??¥???a??
a??e°¢e°¢???eˉ·e????????????ˉ??¥?1??o?e??e??????3???????a??????????????eμ·??¥e??e?????
a????ˉ???????°????????°??§????????????ˉ??¥?1??o?e??e??????3??????¥????°??????e?????e????°?o??????¢?1???????e¢???°??¨?o????e£??¤§e????????a??
a????|???e??e??????????°??¨????μ????1??·?????¨e?£e???????????????¤??????????a??
a???°????????°??§?????????¥e????¨???????????ˉe°??????????????????ˉ??|e?¤eˉ????a??e??e?e??????¤§??????e???¤????????3?3?????¥????
a????μ??μ??????????????e?¤eˉ????????????1?°????a??
a????1?°?a?|a?|a??e??e??????-?e??????????a??£??????????°±??ˉ??1?°???????????§?????¨?§°?°±??ˉ??1?°?-e??e?????
a??eˉ·e???????e?¤eˉ??????1?°???ˉ?????ˉ??1?°?-e??e?????a??e???oo???e§?e?a?·±????£°e?3e????¨e¢¤???????|?????ˉ1??1e?¤eˉ?e??e??????-????e?£?1??????????e??e¢?e?????e??e§£???
a?????a?|a?|??????1?e?¤eˉ???1?°????a???????????????|??????£???
a?????a?|a?|????°±??ˉ??1?°?-e??e?????eˉ·e???????¨??ˉ???a??
a??????????ˉ??????????1?°?????????ˉ?????????a????????????1??????¨?o?eμ·??¥???
a???????????????°±??ˉ??1?°????e??e?°???e?£?????·e¤????????????????e???o?????1???a??e??e??????-??′?¥?????¤§??????
a??e?°???e?°????????????????ˉ?o¢e?2???e???°?e????a??
a???ˉ1?ˉ1?????????????ˉ???e?2???????±????a??
a????????-??-???????a??
??????????′?¥????????o??????¥?????????e??????1???-???e£?????a????????|?????????-???°±???e¢??3??o??????¢??·?°′????¥1???1???ˉ??¥e¢???¥??????e£???????e?????????ooe???¥??????e¢???°???
???e??????o?????????????????3e±????????¨??ˉ??¤???o????
a???????????????????a?????e£?????¤???o???????o?????????
a???????????a???????????e?ˉ????????1?¤′???
a??????¨?????????a?????e£??????????e??e?????
a??????¨?????????a??????????????????-?e??????????????
a????ˉ?????????????????e?£?£μ???????¥???????????¥?o???????a?|a?|??ˉ??????1??????????eμ·????????§???e???o?????¤?????????ˉ???3?????o????a??
a?????a?|a?|??o????1????a????????????????£???
a?????e£?e?????e|???¥?o????e??e??????????±e?????a??
a?????e£?a?|a?|????1????e£????a??
a???-???????°±??¥e???o????a??
a?|a?|
?????????e???ˉ1??1??????1??????????e£??1????????o?e¢?e¤¥?-????????????±??????????????????o?????????????????????????????o???????e??o?e??e????????e§?????????????????????????e???????1?????????e£???°?o???ˉ?????ˉ?????a?oo?±?????????a?oo?±???¨e?????e??????¤?????o?e???????????????1?e?′?2??????????????????????????????′??ˉ?????¢??3e±?????o???????????μ?????¨e?£???????1?e?′???e????????????-¥?-¥?????o???e?·e?±???g