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