Ключевые слова: advertisement, answer, ask, assistance, background, black, blackboard, blank, board, business, chalk, chalkboard, communication, concept, confusion, copy, copyspace, design, drawn, drawning, education, empty, faq, frequently, hand, help, icon, idea, illustration, information, interrogation, isolated, learning, mark, message, object, point, problem, question, questonmark, school, sign, solution, space, support, symbol, text, white, why, write,