householder ??? ??? ????? ??????? ??? ?? ??????? ????? ??????? ??????? ??? ???? ???? ??? ?? ????? ????? ?? ????. ??? ??????? ???? ?? ??? ?? ?????? ?? ??? ?? ??????? ??????? ??? ?? ??? . ????? ??? ??? ?????\ ?????? ???????? ???? ????? ????? supervision ????? ?? ??? ????? ??????? ? ????? ??? ???? ??? ???? ????????. ??????? ???