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.

I don 't go into details , but I 'm not sure why .
Original

His face fell and he sat down .
Original

They were few , but some stood firm .

Inversion