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