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Grey hair professor pointing on something at blackboard
Grey hair professor pointing on something at lecture hall
Grey hair professor sitting on table in lecture room and holding book
Senior lecturer holding piece of chalk and looking away
Smiling grey hair professor holding paper plane in lecture room
Senior lecturer leaning on table and looking away
Happy senior lecturer buttoning shirt
Grey hair professor holding stack of books
Senior lecturer pointing on something in lecture room
Smiling senior man looking at camera while touching jacket isolated on grey
Smiling elderly man in eyeglasses and bow tie looking at camera isolated on grey
Senior man in stylish tweed suit looking away in front of white brick wall
Positive senior man talking on smartphone and pointing with finger isolated on grey
Full length view of man in suit and eyeglasses sitting on high stool and reading newspaper on dark grey
Serious man in tie touching chin while looking at camera isolated on black
Elderly man in suit and eyeglasses looking at camera while talking on cellphone isolated on dark grey
Happy bearded speaker in glasses talking near microphones and brick wall
Thoughtful senior man in grey jumper and tie holding hand near chin isolated on black
Serious senior man pointing with hand and talking on cellphone while sitting on dark grey
Businessman in stylish formal wear adjusting eyeglasses and looking at camera isolated on dark grey
Elderly man in bow tie and blue jacket using smartphone isolated on grey
Positive senior man in eyeglasses talking on mobile phone while looking away isolated on black
