??? ??? ??? ?? ?????, ?????? ??? ??? ?????. ??? ???? ??????? ?????? ????? ? ??????? ???????. ??? ???? ??? ?? ????? ??? ???? ??? ????? ????? ?????. ???? ??????? ????? ????? ?? efficient, ??? ?? ????? ???? ??? ???? ???? ????. ??? ????? ??????, ???? ????? ????? ??? ???? ?-??????, ???? ?????