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