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.

Example Input: " Let 's mimic a truce .
Example Output: Changed

Example Input: A loudspeaker called out for everyone to pile on board in an orderly fashion .
Example Output: Original

Example Input: What else could she speak of when any discussion of substance spewed on unstable territory ?
Example Output:
Changed