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