In this task, you are given a sentence. You must judge whether a single noun or verb has been replaced with another word with the same part of speech. The inversion would result in the sentence sounding unnatural, So unnatural sentences will be considered changed. Label the instances as "Original" or "Changed" based on your judgment.

[Q]: " Okay , maybe a thousand , " the man said quickly , backtracking .
[A]: Original


[Q]: The anger was still there , but it was tempered by the fact that she had come out of it unharmed .
[A]: Original


[Q]: Looking back , he sees the heart of the city is still beating , even as the north end works through its death warrants .
[A]:
Changed