Instructions: 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.
Input: A small aircraft , probably a jet , must have gone out of control at takeoff , left the runway and ploughed into several stationary aircraft .
Output:
Original