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]: He used to spend hours perfecting the old books . "
[EX A]: Changed

[EX Q]: Catherine , who was listening to the physician 's dire prognosis , jumped up from her chair and dashed for the door of the chamber .
[EX A]: Original

[EX Q]: Beth and Rob : her sister and brother-in-law , were busy packing groceries in the front door , as Kit rips the wooden crate from the trunk .
[EX A]:
Changed