0 Hi Ahn02br 02br 00I would add an article:02br 00"01font 00An02font 00 international currency system is necessary 01font 00for 02font 00economic action among countries01font 00 to02font 00 work properly. "00Other than that, I see nothing 01u 00grammatically02u 00 wrong with the sentence. Whether 01i 00action works02i 00 is another thing.
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