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