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abstract, adult, audience, background, blur, blurred, blurry, boardroom, bokeh, business, businessman, center, classroom, computer, concept, conference, convention, corporate, crowd, defocused, disorganized, educate, education, event, events, exhibition, focus, group, hall, laptop, lecture, lecturer, light, lights, meeting, notebook, people, person, presentation, press, professional, room, seminar, sit, speaker, speech, spotlight, student, table, training,