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Originally standing for "Japanese Domestic Market", JDM is a slang term for "right-hand drive". Here, JDM is a backronym where "J" stands for a city starting from "J" located in right-hand drive countries, i.e. Jakarta and Johor. Meanwhile, "DM" remains standing for "Domestic Market". Henceforth, JDM stands for "Jakarta Domestic Market" or "Johor Domestic Market".
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