41 Publishing, namely, on demand digital publishing of printed books, audio books and educational and teaching materials; Electronic publishing services, namely, publication of text and graphic works of others on-line, featuring educational textbooks and teaching materials; Providing on-line publications in the nature of e-books in the fields of economics, finance, accounting, marketing, advertising, management, business, mathematics, science, social science, communications, psychology, sociology and applied sciences; Educational services in the nature of a website featuring online non-downloadable electronic textbooks; Educational services, namely, providing online homework tutorials and lectures for homework management for students and faculty related to designated problem materials, course materials, customized homework assignments, quizzes, tests and grading at the secondary and college levels