???? ?????? ???? ???? ???????? ???? ???????? ??? ???? ????? ????? ? ??? ???????? ???? ???? ???? ???? ???? ????? ???? ?????? ????? ??? ????? ??? ????? ???????? ???? ???? ???? ?????? ????? ??? ???? ????? ???????? ???? ?? ????? ????? ?????? ????? ??? ??? ??? Defini