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Topic written in white chalk on a black chalkboard #157777210
Description
Topic written in white chalk on a black chalkboard . gray background, blackboard, subject, smart, education, hand, teacher, act, bill, focus, government, , limited, one, time, class, classroom, college, concept, drawing, learn, school, symbol, texture, writing, word, handwriting, calculation, calculus, children39, complex, elementary, equations, formula, frame, high, illustration, kids, knowledge