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????? ?? ??????? ????? ?? ??????? (Letter of Credit ?? LC) ??? ???? ?????? ???? ?? ????????? ??????? ??????? ?????? ????? ?????? ??????? ??? ????? ????? ????? ?????? ?????? ???? ???? ??? ??????? ??????????? ???????? ??????? ??? ?????? ???????? ??? ?????? ??????? ???? ??????? ??? ??? ?????? ????????