Ключевые слова: answer, ask, bubble, check, checklist, choice, class, computer, concept, contour, design, exam, faq, film, flat, form, frequently, graphic, icon, illustration, information, internet, isolated, learning, line, linear, list, mark, movie, online, outline, pattern, questionnaire, quiz, random, seamless, set, sign, speech, strip, study, survey, symbol, technology, tick, training, web,