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: Who set up the bombing ?
Example Output: Original

Example Input: We flushed everything else with hydrogen gas and heavily chlorinated water . "
Example Output: Changed

Example Input: But these protectors stood , unharmed and unafraid .
Example Output:
Original