Ключевые слова: abstract, advertisement, advertising, art, background, billboard, black, blackboard, board, border, chalk, chalkboard, class, classroom, college, communication, composition, concept, copy, design, drawing, education, element, formula, frame, graphic, hand, illustration, learn, lesson, letter, mark, menu, message, note, school, scribble, set, sign, student, study, symbol, table, teaching, text, university, wooden, write,