???? ??? ????????? ??????????? ????????? ???? ??? ?????????????? ????????, ????? ????????? ?? ????????????? ? ?????????? ??? ??????????? ??? ? ?????????? ???..??????????? ????????????? ??? ???????? ? ?????????? ??? ?? ??? ?? ???????? ??? ????? ????? ??? ?? ??????? ??? ??? ?? ???????? ???? ??????? ??? ???? ????????Develop a tracing rule to trace un