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Professor writes scheme on board with formulas appurtenant to lasers

Professor writes scheme on board with formulas appurtenant to lasers

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Professor stands near board with formulas and scheme in classroom

Professor stands near board with formulas and scheme in classroom

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Professor writes formulas on board with scheme and turns around in classroom

Professor writes formulas on board with scheme and turns around in classroom

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A young female student writing a formula on the blackboard at biology class

A young female student writing a formula on the blackboard at biology class

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