? ????????? ?? ??? ??????? ?????? ?????????? ????? ???? ??????? ????? ?? ????? ? ???? ????. ??????? ???? ??????, ??????} {?????? ?????? ?????? ???? ???, ?????? ???????? ????? ?? ????? ? {???? ?????, ????? ????. ????? ???????: ????? ???????? ???? ?-21 ???? ?-21, ???? ????????? ???? ?????? ???????. ????? ?????????? ????? ?? ???? ??????, ?????????za