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: I really shouldn 't have provoked her like that .
Example Output: Original

Example Input: The rock face was steep , but provided many hand and footholds to aid in climbing .
Example Output: Original

Example Input: " Ride up his arm first , then lock him in the storeroom . "
Example Output:
Changed