????? ????? ??????? ????? ?? ????? ???????. ???? ?????? ?? ??? ?????? ?????? ???? ???? ???????, ??? ????? ??? ???????. ?????? ?????? ??materialized ?? ??? ????? ?? ???????? ? ????????? ??? ??????? ???????. ??????? ?? ?? ????: ?????? ???? ?? ???? ??? ?????? ?????? ??? ????? ?????? ??? ??? ???????

??? ????? ????? ????? ???? ????? ????? ??????? ???? ??? ????? ??? ???? ????? ?????? ????? ??? ????? ?????? ???? ??????? ??????? ??????? ???????. ???? ???? ???????? ????????? ??? ???? ?????? ??????? ??????? ???? ???? : ???? ???? – ???? ?????? – ???? ????? ???? – ???? ??????? ?????? – ???? ?????? –