????? ???? ?????? ??? ?????? ??????? ???? ???? ??? ????? . ????? ??? ?????? ?????? ????? ??????? ?? ?????? ??????? ??????? ???????? . ?? ???? ??? ?????? ???operate ???? ??? ?????. ???? ??????? ????? ??? ?????? ?????? ?????? ??? ???? ????? ????????? ? {??? ??????????? ?????? ??