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]: It was titled : Riddle of the Pink Pyjamas The writing was hard to make out .
[A]: Original


[Q]: Sure ... why unite it .
[A]: Changed


[Q]: His foggy alcohol saturated brain struggled to explain the changing density of the light , he couldn 't make sense of what he thought he 'd seen .
[A]:
Original