???? ?????? ??????? ?????? ????? ????? ????? ?? ??? ????? ?????? ??????. ??? ????? ???? ????? ?????? ??? ???????. ????? ????? ?? ??? ??????? ????? ??? ??? ???? ???? scarcity of ????????? ?? ??????. ???? ?????? ?????, ????? ????? ?? ??? ??????? ???? ?????? ? ??? ????. ??? ??? ???? ???? ??????