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: " But - " I dialed another informant and initiated a similar , but more circumspect , line of inquiry .
Example Output: Original

Example Input: " Yes sir , " one of the soldiers replied , nearly a dozen in total -- each seated in front of a workstation .
Example Output: Original

Example Input: I was afraid I had been intrusive but she said it hadn 't been firmed up . '
Example Output:
Original