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Grey hair professor pointing on something at lecture hall

Smiling grey hair professor holding stack of books with apple on top

Senior lecturer leaning on table and looking away

Senior lecturer pointing on something in lecture room

Smiling grey hair professor holding piece of chalk

Happy senior lecturer buttoning shirt

Grey hair professor pointing on something at blackboard

Grey hair professor sitting on table in lecture room and holding book

Positive senior man in blue jacket and bow tie touching eyeglasses isolated on grey

Positive senior man talking on smartphone and pointing with finger isolated on grey

Smiling elderly man in eyeglasses and bow tie looking at camera isolated on grey

Elderly man in bow tie and blue jacket using smartphone isolated on grey

Smiling senior man looking at camera while touching jacket isolated on grey

Excited senior man in bow tie pointing with fingers at camera isolated on grey

Smiling senior man holding medical mask isolated on grey

Confused senior man showing dubium gesture while looking at camera isolated on grey

Smiling senior man in shirt and jacket pulling hand at camera on blurred foreground isolated on grey