Ключевые слова: background, billboard, blackboard, blank, board, boards, business, class, classroom, college, color, communication, dirty, educate, education, elementary, empty, erase, frame, highschool, horizontal, image, info, learn, lesson, lessons interior parquet, message, messy, note, notice, notification, organize, primary, remind, reminder, rooms, school, studies, study, teach, texture, university, view, wood,