Man contemplating mathematical calculations on blackboard in classroom
Contributor: Photocreo Bednarek
ID : 733930811
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Keywords
man, blackboard, calculation, classroom, contemplating, mathematical, indoor, alone, thoughtful, education, thinking, complex, professional, teacher, standing, intelligence, blackboard, 1, person, academic, formula, study, sharpened, serious, day, analysis, understanding, concentratingRelated items
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