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????? ?? ??????? (Letter of Credit - LC) ??? ???? ???????? ?????? ???? ?? ??????????? ????????? ???????? ???????? ?????? ??? ????????? ????? ???? ???????? ????????? ??????? ???? ??? ???? ?????????? ?? ?????? ?????? ????? ??? ??? ??? ?????? ??????????? ???? ?? ?????? ??? ????????? ???????? ???? ???,