Ключевые слова: accessibility, alphabet, background, blind, blindness, book, braille, braille code, characters, closeup, code, communicate, communication, communications, design, disability, disabled, document, dots, education, finger, hand, handicapped, health, information, invalid, language, learning, letter, literature, page, person, point, read, school, sense, senses, shape, sign, social, student, studying, symbol, system, text, texture, touch, vision, white, yellow,