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