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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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Professor cleans board with formulas appurtenant to lasers

Professor cleans 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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the student writes on the Board. To draw on the chalk Board scheme. the student passes the exam at the University. The teacher writes the formula on the blackboard for lectures

the student writes on the Board. To draw on the chalk Board scheme. the student passes the exam at the University. The teacher writes the formula on the blackboard for lectures

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Nuclear fusion. 	We write with chalk on a board.

Nuclear fusion. We write with chalk on a board.

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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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Cute blondhaired teacher drawing a scheme

Cute blondhaired teacher drawing a scheme

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Blondhaired teacher drawing a scheme

Blondhaired teacher drawing a scheme

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Group of students in classroom at the university are listening attentively the lecture on Economics of famous Professor. Speaker in blue suit with the microphone is delivering a lecture and pointing

Group of students in classroom at the university are listening attentively the lecture on Economics of famous Professor. Speaker in blue suit with the microphone is delivering a lecture and pointing

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