For a CATEGORY may belong one or more books.
A BOOK belongs to one or more categories (or a book can be several times SUGGESTED.
in a department can be cataloged one or more books.
A book is cataloged in a single department.
A BOOK can be included in a cart or more users.
A USER can include in his cart one or more books.
A USER can make one or more orders. An order is made
only one user.
A BOOK can be included in one or more orders. ORDER A
includes one or more books.
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