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| Class Summary | |
|---|---|
| Book | [entity] This entity represents a type of book, identified by authors and title (not a concrete physical book). |
| BookOnStock | [entity] This entity represents a concrete physical book. |
| Customer | [entity] This entity represents a customer of a library. |
| Loan | [entity] This entity represents a concrete loan of one
BookOnStock by one Customer. |
| Reminder | [entity] This entity represents a reminder for a delayed book return. |
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