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]: Charles was worried because when you were summoned by the Council , the algorithm gave you only a location and a half-hour window of time .
[A]: Original


[Q]: The falcon screeched and dove at one of the enemies .
[A]: Original


[Q]: Well in advance , the scientists started studying new solutions , planning the stages to bring them to production .
[A]:
Original