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