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The term "langue d'oïl" refers to the group of Romance dialects spoken in northern France, which evolved from Vulgar Latin. This linguistic distinction is based on the word used for "yes" in these dialects, which was "oïl" (modern "oui"). This contrasts with the "langue d'oc" spoken in southern France, which used "oc" for "yes". The dialects of the langue d'oïl eventually developed into modern French.1234

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