instruction:
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.
question:
Her mother stuck her head around the doorframe , and there was a knock on the door .
answer:
Inversion


question:
She took a step back and he immediately narrowed his eyes .
answer:
Original


question:
Nia stumbled in and the door opened .
answer:

Inversion