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