Language (2) Piping (2) Tools (2) Linguistics (2) Learning (2) Hypothesis (2) Government etiquette (2) Ethnicity (2) Ethnic attitudes (2) Diglossia (Linguistics) (2) Bilingualism (2) Research (2) Use (2) Usage (2) Language, style (2) Science (2) Population (2) Students (2) Tuberías--Diseño y construcción (2) Ciencias (2) Investigación (2) Lingüística (2) Recherche (2) Porte (2) Population (2) Linguistique (2) Insécurité (2) Identité culturelle (2) Apprentissage (2) Arrestine 4 (2)