Ключевые слова: advice, answer, any, ask, assistance, background, black, blackboard, board, business, chalk, chalkboard, communicate, communication, concept, confusion, consulting, discussion, draw, education, hand, help, idea, info, information, intelligence, knowledge, meeting, message, office, presentation, problem, question, school, sign, solution, solve, study, support, symbol, text, think, unclear, understand, white, word, work, write,