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In page Luxembourg:

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Each of the three official languages is used as a primary language in certain spheres of everyday life, without being exclusive. Luxembourgish is the language that Luxembourgers generally use to speak and write to each other, and there has been a recent increase in the production of novels and movies in the language.[citation needed] At the same time, the numerous expatriate workers (approximately 44% of the population) generally do not use it to speak to each other.[9]