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: He stilled , his muscles cramping from strain .
Example Output: Changed

Example Input: Something was off this time ; I could almost feel the heaps .
Example Output: Changed

Example Input: Tiny rainbows slid back and forth across their surfaces .
Example Output:
Original