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volunteering, charity, cleaning, people and ecology concept - group of happy volunteers with garbage bags cleaning area in park
Audience Listens to Lecturer at a Conference Meeting Seminar Training. Group of People Hear Presenter Give Speech . Corporate Manager Speaker Gives Business Technology and Economic Forecast.
Raising Hands for Participation.
Business and entrepreneurship symposium. Speaker giving a talk at health care workshop meeting. Audience in conference hall. Rear view of unrecognized participant in audience.
Speaker on the podium. People at conference hall, rear view

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