μu911??￡oμuèy°u??ê?èy?????u′o3?￡o?u?èéu(4)
??iu??1???°?è¨?uod?′?-di?é2?μ??′????
áuo?è?′?ê±′??i￡??x????μ??u′o?èéu??oo￡?2???ê??d??μ???·?μ???2à￡?d??dμ??ˉ??￡??e?a￡???????i·￡?o????oo???μ?éyiu?eà′￡?è?éi??±á￡?°μ°μ?ox?à?o1￡?áé?êoa??o???xo?iiáá??eà′?￡
?u′o?èéu￡?é?2??é2a￡??a?uμ???ê?￡??u±??i2??u3????u??dt′o???a??′o?§êà??μ±?d￡???￡?o|??ê??é??μ?è???￡?
?°?ˉo?x??u??ê?￡?è??ox??u????￡????à￡?èy′uμuxo￡?i¨i¨??ê?·???￡??èè?è?′?￡????i3é?a?oμ?o?i????ê°é￡??±
??????￡?
o?à2à2￡?o?à2à2￡?o?à2à2?-?-
??è?????￡??a???u′o?èéu?i2??a′oo?′|??3?o?±u′o?i￡??aé?μ??i????é?￡???ê?o?i·??ii????μ?oué?o°êt￡??udé??á?á?x÷?i￡?o?éá??3?à′￡??i??ê?è?é??à￡?é±?u??2??·￡??a1a3?ii??é??￡
?°°?°?°?°??-?-iià?êt￡??ao1???i￡???ê????u′o3?￡???ê?o?′uoé??x?è?￡?ê??°±2￡?2??ué±?o?-?-???-?-?±
??àê￡?
áuo?è?μ??°o?￡??1?′????￡?o?μà?a1a?io??oêˉ±à??μ??u?è￡???àx2??°?u?uμ?′o?ao1???i??é?éá????3?￡???àêo???xo￡???áuo?è????u??é±￡?
??iu??1???°?è¨?uod?′?-di?é2?μ??′????
áuo?è?′?ê±′??i￡??x????μ??u′o?èéu??oo￡?2???ê??d??μ???·?μ???2à￡?d??dμ??ˉ??￡??e?a￡???????i·￡?o????oo???μ?éyiu?eà′￡?è?éi??±á￡?°μ°μ?ox?à?o1￡?áé?êoa??o???xo?iiáá??eà′?￡
?u′o?èéu￡?é?2??é2a￡??a?uμ???ê?￡??u±??i2??u3????u??dt′o???a??′o?§êà??μ±?d￡???￡?o|??ê??é??μ?è???￡?
?°?ˉo?x??u??ê?￡?è??ox??u????￡????à￡?èy′uμuxo￡?i¨i¨??ê?·???￡??èè?è?′?￡????i3é?a?oμ?o?i????ê°é￡??±
??????￡?
o?à2à2￡?o?à2à2￡?o?à2à2?-?-
??è?????￡??a???u′o?èéu?i2??a′oo?′|??3?o?±u′o?i￡??aé?μ??i????é?￡???ê?o?i·??ii????μ?oué?o°êt￡??udé??á?á?x÷?i￡?o?éá??3?à′￡??i??ê?è?é??à￡?é±?u??2??·￡??a1a3?ii??é??￡
?°°?°?°?°??-?-iià?êt￡??ao1???i￡???ê????u′o3?￡???ê?o?′uoé??x?è?￡?ê??°±2￡?2??ué±?o?-?-???-?-?±
??àê￡?
áuo?è?μ??°o?￡??1?′????￡?o?μà?a1a?io??oêˉ±à??μ??u?è￡???àx2??°?u?uμ?′o?ao1???i??é?éá????3?￡???àêo???xo￡???áuo?è????u??é±￡?