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