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a boy standing in front of a blackboard in a classroom, by Adam Marczyński, pexels contest winner, audience in the background, pythagorean theorem, a person standing in front of a, lachlan bailey

a boy standing in front of a blackboard in a classroom, by Adam Marczyński, pexels contest winner, audience in the background, pythagorean theorem, a person standing in front of a, lachlan bailey

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