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Why comment this line15 ,also get the same output?

<https://kotlinlang.org/docs/cancellation-and-timeouts.html#cancelling-coroutine-execution>
I follow offical doc,I don't known why already call cancel() method then call join(),Why not join() first then cancel(), What is the point of calling the join() method after cancel()

`.join()` blocks the current coroutine until the job is completed
`.cancel()` asynchronously cancels the job. it may continue running if it is in the middle of blocking code or `withContext(NonCancellable) { }`

`.cancel()`+`.join()` will cancel the job and wait for it to end. there is a `.cancelAndJoin()` convenience extension function which is equivalent
`.join()` + `.cancel()` will wait for the job to complete, and then cancel nothing. this is not useful