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