? I E???? ??? C???E?C?? ??I ???? ??? ???C? ?? C?????E ?C?CIE?C? ?? C???UC? ?C????? (1) .
??? ???E E? C???I ?C ???U ??? ??C C???E C??C??? ??C ????? ??? ??? C???C??E C???E???C? ????? ?? ??E?C C???? ?? ??E? AI? ?E?CI?? E? ??? C??C?EE? ?C??C????C? C???I? E?? U ??C ??? U ?? ?CE?C ?? ?C?E C??U? ??CE???? ??I?I ?????? ????I ?????? ?C ?? ???E?C ?? ??E ???? ??? ??E ????E EC???C?E? ??C ??U? C???? E?? C???EE?? ???I ?E? ???E E? I?OE C????C?? E?? ?C?? E??C C??IE ??I? ???? ?I??E ?C??E? ?C?EC? ???? ?? ?????C ???? ?EC?C? ???C I???C ??? C?UC?E ???E????C E?C ?? I?? ?????? ?O??C? E??? ??? C?I?? C??? ??E??? ????? ??I C???C? ??C?E C???C?? ?C??C?:
?? C ?C UUI?E? ?C?I?? ????U?C ... E?? ?C?U?? ?C?EUU???C EC???C??? (2)
(1) C???E CIE?C?C?: 53.
(2) C???C??: C??EC? ????C E??? ?? E?E?.