?????? ?/? ??????? ? ??????? ??? ????????? ???? ??????, ?? ?????? ?????? ? ????????, ???????? ???????? «????????». ?????? ????????? ???????????? ?? ????????? ??????. ?? ?????? ???????? ??????? ?? ???????? ??? ????????? ???????? ???????, ???????? ?? ? ????????? ??????? ??????????.Ferguson's concept was to combine a link by means of two decreased a