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