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 presented him with her back and it was all Jason could do to pull the tab up instead of down .
[A]: Original


[Q]: Wrapped in a red cloth was a brown mixture , ground down like grains in a mill to a course powder that emitted an awful stench .
[A]: Original


[Q]: He scrutinized his checklist one more time as he waited for each engine to warm up .
[A]:
Changed