Mr$.$ Hook is an academic library manager He is responsible for purchasing and maintaining books and periodicals, which can be read and$/$or borrowed by registered users. The library serves $3$ types of users: guest users, studentsand teacher For all the types of users, the library assigns a unique user number $.$ AdditionallyMr. Hook needs to know their name $($first and last names$),$ age, and education level. Students must also inform which course they are takingtheir student ID number, and the year of entryTeachers must indicate their departments, a list of courses they teach and their degree. Guest users do not need to provide any additional information. Books and periodicals are both considered publications. A publication has a unique ISBNtitle, issue numberyear and number of available copies. Periodicals have the name of the organizers, subtitle $($which registers the theme of that edition$)$ volume and number Books has a list of authors, publisher, and city All the users can borrow or read books, but only read periodicalsBook loans are different for each type of user Students: maximum of $4$ books, for up to $14$ days Teachers: maximum of $10$ books, for up to $180$ days Guests: maximum of up to $4$ books for up to $7$ days When a user borrows a bookthe checkout date, expected return date, and actual return date must be recorded. In case of delays to return the booka fine must be calculated, in the amount of $1\mathrm{.}00$ per day of delay Coples must be available for borrowing Users can read any available publicationAbout a readingMr. Hook wants to know who is reading the publicationwhat publication they are reading and the date and time the user checked out and returned the publication to the returning tray Teachers can request books for class research, which can no longer be borrowed, but only read at the library. When the teacher requests a bookMr. Hook wants to know the date when the request was made and the expiration date. Table $1$: Entity types