TASK DEFINITION: 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.
PROBLEM: His face darkened for a brief second , and Jax looked up at me swiftly .

SOLUTION: Inversion

PROBLEM: When she paused , he nodded , encouraging her to continue , and Jake could hear the affection in her voice .

SOLUTION: Inversion

PROBLEM: The continuity of the brain 's existence is unbroken , but the brain , at its option , can have them replaced at any time .

SOLUTION:
Inversion