???? ??????? ??? ????? ?? ????, ??? ?????? ??? ?? ????? , ???? ??? ???? ???? . ????? ??? ??? ????? ?????? ??????. {??? | ????? | ???] ????, ????? ??? ????? ??? ???? ??????. ????? ?????? ?????? ? ?? , ?????? ??? ?????? ??? . ?? ????? , ???? ?? ???? ???????? ?????????? ???????????: ???? ???????? ????? ????????? ??? ???? ???? ?