??? ??? ? U? ???C? C???? ?I?UC??? ???? C??I ?? ??? C??UEC? C?????E C??? EE??? ??C???? ??C ?U? ???? C????:
? UI ???? C??U??? ???? ?? ??CE????? ... ??C E????U?? ?? C?E?? C??U?C???? (1)
??I ?I? ??E?E ?E?C? ???? ???E?? ?? C????E ?E????? ?? ?????C? ?I???? U?C??C E???E ECEEE? ???IC? ?C?IE? ?C ??E??? ???C C?I?? ??? OIE?C? ???? C??U? ?? ?????? ?? ??C?? ????E ?? ?C?CE?C? ?? ??? ?C ???? C?AI??? ??? C?EECE ?? ?E? ??? C???C??? ??C E?C???? ?????? C????E ??? C?E?C? ??C??C? ??? ??????? EC?I?? C????E C??? EIE AEC?? ?? I?C?? C?E? ?U?E ?E?E?E ?E? ?CIE E??? E??C?C:
? U?????? ?E?C?C? ?UIC??? EC??U?C ... ?????C? ??C ?C C???E? I?? ??C?C (2)
(1) I??C??: 76.
(2) ?IC??: ??? ?I??? ??? C??E?? C????? C????: ??? C?????? ??? C?ECEE ?? C???E.