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: " What exactly is a human golem ? "
Example Output: Original

Example Input: " We need to do our human testing , don 't want to have any more deliveries by waiting for vaccination of a test subject .
Example Output: Changed

Example Input: " Ah now , A.J. , you should be lookin ' happier this day . "
Example Output:
Original