??? ?????? ??? ??? ???? ??? ??? ??? ? ????? ?????? ? ???? ??????? ??????? ???? {????? ????? ?????? . ???? ????? ??? ?????? ??? ??? ????? ?- ????? ?????? ???? ??????. ??? ?????? ??? ,???? ?????? ???? ??? {?-?????? ?????? ????? ???? ????? ????? ?? ?????.??? ??? ???? ?-????? ????? {???? ???? ???? {????? ????? . ????-?? ????? ?? ???????

?????? A ?-?????? ?? ??????? ????, ?? ?? combined ?????? ??? ?????? ????? ?????? ?????? ??????. ???? ????? ?-???? ?? ???????? ???, ???? ????? ????? ???? ????? ?? ??????? ??? ???. ?????? A ???? ??????? ?? ??????, ???, ???????? ?????? (B3) ??? ????? ?????? ?? ??????, ?-???} ???? ?-?????? ?????. ????????? ?????? : ?????? A ?????/??????/???