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.

[EX Q]: We flushed everything else with hydrogen gas and heavily chlorinated water . "
[EX A]: Changed

[EX Q]: Finally in the early hours of the morning when floods came we were able to take the trench .
[EX A]: Changed

[EX Q]: When I finally made it outside , it was like stepping into an outdoor hallway with dividers and dumpsters beside each door .
[EX A]:
Original