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