Ключевые слова: alphabet, background, billboard, black, blackboard, blank, board, chalk, chalkboard, childhood, choice, class, classroom, clean, communication, copy, draw, drawing, education, formula, frame, graphic, grunge, horizontal, illustration, learn, message, nobody, note, object, old, primary, school, school board, scratch, scratchy, space, teach, teacher, text, texture, university, wood, wooden, write,