Ключевые слова: abrasioned, ad, advertising, ancient, background, billboard, black, blackboard, blank, board, chalk, chalkboard, class, classroom, close, closeup, communication, concept, copy, design, dirty, drawing, education, element, empty, frame, grunge, horizontal, lesson, message, note, old, panel, pattern, red, school, scratch, sign, space, student, symbol, teach, teacher, text, texture, used, wallpaper, white, write,