In this task you are given a sentence with one coordinating conjunction (for, and, nor, but, or, yet, and so). You must judge whether the order of two coordinated clausal conjoints have been inverted or not. Inversion would result in the sentence sounding unnatural. Label the instances as "Original" or "Inversion" based on your judgment.
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Question: It paid off and they decided to take a chance with him .

Answer: Inversion


Question: No one mentioned her whereabouts , and what worried him more was he had not seen her since that night .

Answer: Inversion


Question: He didn 't argue , but a muscle twitched in Rodin 's jaw .

Answer:
Inversion