??? ?? ????? ?????? ??? ????? ????? ???? ?????? ??? ???? ?? ??? ??? ?? ??? ?? ?????? ?????/????? ????? ??/???? ????? ?????? ?? ????? ????. ???? ????? ???? ?????? ??? ??? ?? ????? ????? ?????/??????? ???????? ? ?? ????? ???? ???. ??? X ??? B ??? C ??????? ??????: ?????? ????? ????? ???? ??? ?? ????? ?? ????? ???? ????? ???? ???????? ??? ?????