Use the solution of the Sequence Diagram and System Class model to make an Operation Pattern for the operation bookClass from the Customer point of view. Sequence Diagram: System Class Model

Example of Operational Pattern:

\begin{tabular}{|l} \hline pkg \\ \hline \end{tabular} 2 Operation Pattern : delete_class Operation = deleteClass Description = The trainer deletess a class. When the class exists and is taught by that trainer and no Customer is registered, the class is deleted and the trainer gets credit back. You can assume that the trainer with the given email exists in the system. I used ScheduledT instead of Scheduled_ T since it it easier to write. \begin{tabular}{|l} \hline pkg \\ \hline \end{tabular} 2 Operation Pattern : delete_class Operation = deleteClass Description = The trainer deletess a class. When the class exists and is taught by that trainer and no Customer is registered, the class is deleted and the trainer gets credit back. You can assume that the trainer with the given email exists in the system. I used ScheduledT instead of Scheduled_ T since it it easier to write