Ключевые слова: analyze, assistance, background, black, blackboard, board, brush, brushstroke, brushstrokes, business, chalk, chalkboard, classroom, coach, color, concept, course, development, discovery, distance, drawing, education, elearning, exam, exploration, information, knowledge, learn, lesson, multicolor, online, paint, paintbrush, professional, school, seminar, studing, study, success, teach, text, texture, think, trainer, training, webinar, word,