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