Ключевые слова: arm, background, billboard, black, blackboard, blank, board, chalk, chalkboard, class, close up, concept, copy space, design, dirty, drawing, education, empty, erased, grunge, hand, hand writing, handwriting, holding, horizontal, human, learn, learning, lesson, message, new, note, number, old, person, red, school, scratch, smudged, symbol, teacher, teaching, text, texture, used, white, write, writing,