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Exclusive LicenseLanguage PlanningPersian Language and LiteratureLanguage PolicySpeak Mandarin CampaignSecond Language AcquisitionLanguage AttritionChinese DialectsTypically Developing ChildrenUniversity Studentsdown SyndromeLanguage ShiftLanguage RevitalizationScience and TechnologyWord FormationLanguage UsePrinciple of Least EffortRole DeviationChinese CommunityChild Model