Ключевые слова: alphabet, back, background, black, blackboard, blank, board, chalk, chalkboard, children, class, classroom, college, communication, concept, design, doodle, drawing, education, elementary, green, hand, learn, lesson, lettering, mathematics, message, note, outline, primary, school, sign, sketch, space, student, study, supplies, symbol, teach, teacher, text, texture, time, white, write, writing,