? ??? ?? ????? ??????????? ????????, ?? ?????? ??? ??????, ??????? ?? ???????????? ? ???, ??? ?? ????????? ???? ??????? ????????? — ?? ?????? ????? ???? ???? ??? ??????.????-?????????? (???? ? ?????? ???????? / ????????? ??????);??????????? ??????????? ?????????????? ? ???????? ????????, ??????????? ???????, ?????????? ????, ???????, ????????, ??

??? ????? ???? ?????????????? ?????, ???????? ?????, ?????????? ?????? ? ?????? ??????. ?????? ????????? ????????? ?????????? ? ?????? ???????, ??????? ???????? ????????? ???????? ?????????? ? ?????? ???????, ? ?????????, ?? ? ? ??? ????.Usually there’s a single essential element which is used in many means. As an illustration, stacks of symbols