?????? ??????????? ?? ??? ???????? ??????????????, ???? ? ???????? ?????? ????? ????????? ????? ??? ???? ???.????? ??? ????? ?? ?????????, ???? ?????? ???????? ????????? ???????, ?????????? ??? ??????? ??????????.????, ??????, ??????? ? ????????, ??????? ??? ?? ??????????.There are many skills necessary to handle SEM for instance data Investigation