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Publicado: 2017-10-07 03:12:19.041589 Categoría: Tipo: Vídeo Duración (sec): 20.988 sec. Model release: Sí
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Static shot of chalkboard in classroom with math & science formulas No people

Contributor: hotelfoxtrot69
ID : 175679117
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education, learning, study, cognition, teaching, class, classroom, lesson, modern, blackboard, blackboard, board, chalk, writing, mathematic, mathematic, number, science, scientist, formula, algebra, academic, concept, idea, development, solution, nobody, school, college, university


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