login: You can login if you have already registered, using your username and password.signup: You can sign up if you have not registered yet.logout: If you are currently logged in, you can log out at any time.write: You can write a book and add it to the available "books to read".view: Shows all available "books to read".addPage<book title>: You can add one more page to a book you have written.removePage<book title>: You can remove the last page of a book you have written.rates<book title>: You can see ratings of the book as well as the average rating for the book.comments<book title>: You can see the readers' comments of the book.read<book title>: You can read a book from the available "books to read".read<book title><page>: You can read a book starting from<page>.rate<book title><rating>: You can rate a book you have already read.comment<book title><comment>: You can comment on a book you have already read.editPage<book title><page>: You can edit a page of your book.editRage<book title><rating>: You can edit your rating of a book.exit: exit the program.