Given the task definition, example input & output, solve the new input case.
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.
Example: Gideon brought his phone to his ear and resonated with Bev at HQ .
Output: Changed
"resonated" doesn't fit in this sentence.

New input case for you: You are about to embark on an investigation but I don 't know much about that .
Output:
Original