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