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: Mack 's breeding was a pleasant surprise .
Example Output: Changed

Example Input: The cook tossed the biscuit at John , hitting him in the chest with it .
Example Output: Original

Example Input: I 'd always been leery of Eric , but I 'd appreciated his mischief , his single-mindedness , and his flair .
Example Output:
Original