Ключевые слова: analysis, background, blackboard, board, book, calligraphy, chalk, circle, closeup, college, cover, design, diagram, drawing, easy, education, element, equation, exploration, geometer, handwriting, information, learn, learning, manuscript, mathematical, motion, page, paper, pile, position, project, property, publication, research, sample, school, shape, signs, square, study, success, tags, template, term, text, textbook, university, word, write,