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.

There was a tightness in the tendons of her neck , and her nostrils flared at each breath .
Original

In its place was a gash , and the steel post that had been there was gone .
Inversion

Surprised , Jim agreed and the three of them disappeared into what used to be the office of Headmaster Morgan .

Original