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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 writes scheme on board with formulas appurtenant to lasers

Professor writes scheme on board with formulas appurtenant to lasers

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Professor cleans board with formulas appurtenant to lasers

Professor cleans board with formulas appurtenant to lasers

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Lecturer leads the lesson at the university, he educates students with a pointer near blackboard

Lecturer leads the lesson at the university, he educates students with a pointer near blackboard

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Student answers near the blackboard with a pointer

Student answers near the blackboard with a pointer

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Lecturer at the university leads the lesson, he writes formulas on the blackboard and educates students

Lecturer at the university leads the lesson, he writes formulas on the blackboard and educates students

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Student, Teacher encircles with pointer and explains equations on blackboard.

Student, Teacher encircles with pointer and explains equations on blackboard.

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Parents talking with kids in classroom at school.

Parents talking with kids in classroom at school.

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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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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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