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 Input: The singsong voice froze Holly in her tracks .
Example Output: Changed

Example Input: When they crossed in front of the stump they raised their paddles into the air and shouted , " We 're the champs !
Example Output: Original

Example Input: It actually looks like sheer tenacity can be a deciding factor in survival , even if natural selection demands that such profound inferiority be disguised . "
Example Output:
Changed