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.

Q: The toilet flushed , and shopkeeper turned back to watch Oksana emerge from the bathroom .

A: Changed
****
Q: The only power they 'd held over him was that of testing the limits of his elevation .

A: Changed
****
Q: I realize we are completing a group with even numbers .

A:
Original
****