Ключевые слова: 2, alphabet, background, black, blackboard, blank, board, business, chalk, chalkboard, child, class, classroom, concept, copy, copyspace, count, design, drawn, drawning, educate, education, exam, frame, hand, icon, idea, illustration, information, isolated, kids, learning, lesson, letters, message, pattern, pupils, school, sign, space, student, study, symbol, teach, teacher, text, two, white, write,