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]: She had been trying to narrow down a new definition , mathematically stated , of quantum probability .
[A]: Original


[Q]: The ladder , padded in parts with sackcloth and secured to the top of the van by nylon ropes , was thrown over the brick wall .
[A]: Original


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