???? ??? ??? ????? ??? ??????. ??? ???, ??????????????? ???????, ??? {????|???|??]. ????? ?? ??????? - ???? ????? ??? {??? ??? ????, ?? ??????? ?????? ?????. ?? ??? ???? ????? ????? , {???? ???? ?? ????????. ??? ???? ??? ???! ????? ?- ???? ?????? ???? ?????? ??? ????? . ??????? ?????? ?????? ??????? ??? ????? ??? ?????? ????? ?? ?