Ключевые слова: black, blackboard, board, book, business, businessman, class, classroom, coach, college, computer, conference, course, design, education, graphic, group, human, icon, illustration, isolated, learning, lecture, line, man, management, manager, meeting, office, people, person, pictogram, presentation, room, school, seminar, set, sign, speaker, student, study, success, symbol, teacher, teaching, team, teamwork, training, university,