Ключевые слова: addition, answer, blackboard, board, chalk, chalkboard, class, classroom, closeup, concept, deceit, different, dishonesty, education, equal, fact, fraud, green, guidance, guide, half, hand, holding, indoors, information, learning, lecture, lesson, lie, male, man, message, not, notice, number, object, one, people, person, reveal, revealing, sign, single, solve, symbol, teaching, text, true, truth, word,