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1.3.1. Get Book Status Info: This process uses Updated info and Return date to get the current Book Status Info. The output is Checkout Length and Book Status Info.
1.3.2. Calculate Return Date: This process calculates the return date using the Checkout length that is specified by the patron.
1.3.3. Update Book File: This process uses the current book status info to Update the Book file.
1.3.4. Give Patron Book and Library Card: In this process the checked out book and the library card are given back to the Patron.
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