TASK DEFINITION: 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.
PROBLEM: Charles was worried because when you were summoned by the Council , the algorithm gave you only a location and a half-hour window of time .

SOLUTION: Original

PROBLEM: The worms were snake-like things that spat venomous poison and had huge mandibles surrounding multiple rows of razor-sharp teeth .

SOLUTION: Original

PROBLEM: He understood that it was often difficult for same-sex couples to rein , which was why she was trying to do it as a single person instead .

SOLUTION:
Changed