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.

He was camouflaged so well , Neil hardly noticed him .
Original

It takes very little energy , and it 's an easy way to motivate people to do things .
Original

I know a few mages who are keen on it . "

Changed