teacher giving lecture classroom and writing math formulas the board |
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| navigate by keyword : college education classroom student university teacher lecture group professor study teaching people school studying young listening casual knowledge adult male women talking indoors man learn standing academic female desk blackboard men class classmates sitting occupation seminar happy lesson math woman table information multiethnic board caucasian smile person explaining back tablet |
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| Teacher giving a lecture in a classroom and writing math formulas on the board. |
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