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