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Secondary education (en)
Educational levels
Lower secondary education, Upper secondary education
Secondary school curriculum, Secondary school leaving, Secondary school students, Secondary school teachers, Secondary teacher education
Education > Educational systems and levels
تعليم ثانوي (ar), Enseñanza secundaria (es), Среднее образование (ru), Enseignement secondaire (fr)
http://vocabularies.unesco.org/thesaurus/concept9291