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: As they expand they can add more stoves . "
Example Output: Original

Example Input: Like in our own little payback . "
Example Output: Changed

Example Input: The front lines turned and trampled each other .
Example Output:
Original