Furthermore, we hope to sell our program to even more libraries whose representation of holders we cannot anticipate. While others represent holders with phone numbers. To make this task more challenging, some of the libraries that will use our program represent holders with names. A library book is a book, together with a holder (a representation of the person who has the book checked out) and a due date, both of which can change as needed (note that for our purposes, all holders are unique). A book is represented by an ISBN, an author, and a title, all of which cannot change once the book has been created (note that ISBNs are unique). We have been asked to construct a program for libraries that allows books to be checked in and out electronically.
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