!3 ''Rental of coffee dispensers for 3 days:''
|''begin transaction for client''| Joanna |''staff''| Bill|
|'''not'''|''rent''|100||coffee dispenser|''for''|3 days|
|''complete transaction''|
 * ''Checks''
|''rentals of client''|Joanna|
|''rental item''|

|''rental item subset''|
|''name''|''free count''|
|coffee dispenser|10|