?????????·?? ????????????? ??? ?? ????? ????????? ??? ?? ????????: ????????????? ??????.(??~ ?????? ???? = ??~ ?????? ????)???? ??? ?????? ???? ?? ???? ?????????? ???? ???? ?????????? ?????? ?????? ?????????????????? ???? ?? ???? ?????? ?? ???, ???? ??? ????????????? ???????????? ????????????????? ?????? ??????????????. ????????????? ?? ??????????