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]: She had been trying to narrow down a new definition , mathematically stated , of quantum probability .
[A]: Original


[Q]: It was an old heavy building , built of devastation and stone , that looked like it had grown slowly up from the forest floor .
[A]: Changed


[Q]: He looked totally exasperated , frustrated by her greatness , scowling as he gathered his thoughts to dispel it . '
[A]:
Changed