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1. Imagine that you have to design a simple computer system for a library.

Assume for this execise that the library only has two types of books: Printed books and audio
books. Each book has an ISBN number, a title and an author. Printed books have a page count and
audio books have a duration in minutes. The library also has borrowers who can check out books.
Each borrower can have zero or more books checked out at any time. The system needs to keep track
of which books are currently out and when they are due back. The system also needs to keep a
history of past checkouts for each borrower.

Draw a diagram which models all the entities described above and their relationships. Put in as
much detail as you think is appropriate. UML is preferred but you may also submit your answer as
Java code if you don't have a way to draw diagrams.

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