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]: They were hard to read compared with digital notebooks .
[A]: Changed


[Q]: You were a walking and partying erection six days out of the week . "
[A]: Original


[Q]: Riva was right ; the clans never cooperated with each other .
[A]:
Original