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Publicado: 2013-06-06 02:09:36.023129 Categoría: Creativity Tipo: Foto Model release: No
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blackboard with math text

Contributor: Krasimira Nevenova
ID : 53030554
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Foto4096x2616


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mathematic, blackboard, blackboard, closeup, educational, white, dark, school, instructing, improve, education, background, university, formula, physics, compute, mathematic, algebra, theory, chalk, abstruse, complexity, equation, science, computation, board, lecture, incomprehensible, symbol


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