!3 ''Previous rentals within a transaction limit what can be rented.''
|''begin transaction for client''| Joanna |''staff''| Bill|
|''rent''|5||coffee dispenser|''for''|1 week|
|'''not'''|''rent''|6||coffee dispenser|''for''|1 week|
|''pay with cash $''|287.00|
|''complete transaction''|
 * ''Checks''
|''rentals of client''|Joanna|
|''rental item''|''count''|
|coffee dispenser|5|

|''rental item subset''|
|''name''|''free count''|
|coffee dispenser|5|