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Senario Name: ReturnVideo1:  Normal return

Participating actors: Dave: Customer, Hal: cashier

Flow of events:
1. Dave arrives at the counter and hands "2001" to Hal.  Hal presses "return video" button. 

2. The system asks for a membership id. Hal asks for Dave's membership card and scans it, entering his 		
   membership id, "123". 

3. The system retrieves Dave's acount and displays it to Hal. Below the account information the system asks for 
   the serial number of a returned video.

4. Hal scans the barcode on "2001", entering the serial number 12345 for this copy.

5. The system retrieves rental transaction 003471, documenting Dave's rental of "2001", and displays it to Hal.

6. Hal sees that "2001", serial number 12345, has been removed from rental transaction 003471, that Dave 
   has no late fees due, and that he has no other videos rented out under this transaction. Hal selects the 
   "transaction complete" option.
   
7. The system closes rental transaction number 003471.      

8. Hal hands Dave his membership ID and thanks him for his business.