signal-start-event_1 user-task_1 end-event_1 start-event_1 user-task_2 signal-boundary_1 end-event_2 user-task_3 end-event_3 start-event_2 signal-catching-event_1 user-task_4 end-event_4 start-event_3 signal-throwing-event_1 user-task_5 end-event_5