Ключевые слова: blackboard, board, business, chalkboard, class, competitive, complicated, concept, creative, education, equation, exam, expertise, finance, franchise, idea, intelligence, intelligent, investment, job, knowledge, learn, lesson, management, numbers, online, plan, problem, school, science, solution, start, statistics, student, study, success, symbol, teacher, theory, university, wall, white, work, write,