We're supposed to .join() each created SleepingThread object. But this code actually does something completely different from any of the previous tasks and I'm not sure what to do in this case. Usually when we create a new Thread or something inheriting Thread, it's using syntax sort of like
Thread t = new myThread();
But in this task, new SleepingThread() isn't assigned to any variable. There's nothing to stick .join() to.