?????????? ????? ????-???????? ??????? ??????? ???????? ????? ??? ???? ??????, ????????? ?????? ???? ?? ??????? ?????? ????????? ???? ?? ????????? ????? ?????? ???? ???? ?????? {?????? ????????? ???? ????? ?????? ??? ?? ????? ??????? ????????, ?? ??????? ??? ???? ?????? {???? ???? ?????????? ??? : ????? ??????????? ???-? ????????? ????????? ?