I think ISUTubbs meant that "Errand of Mercy" was the start of all those books in real-world terms, the original work that they were all deriving from.
Fair enough!
Also, "prequel" is a subcategory of "sequel," not its opposite. It's short for "preceding sequel," a followup story that is made after the original but is set before it. So a prequel does qualify as a sequel.
Are you sure of that? I've never heard "sequel" used as a general category term that I can think offhand. And that would seem to rule out the ability to non-awkwardly refer specifically to followup stories intended to be a continuation of a narrative rather than a look at the background (prequel) or intermediary story (midquel), which would be strange to me since that's what someone would want to refer to most often. I think "prequel" and "midquel" are parallel constructions, not portmanteaus.
Edit: Yeah, not to go dictionaries-as-authorities, just meaning it as a measure of most common usage in practice, but M-W at least backs me up (and also backs me up on the etymology of "prequel" as a parallel construction rather than a portmanteau). OED too; it specifically refers to something that follows in all its definitions even outside the usual media sense, it always means a successor of one sort or another.
I hope you don't think I'm harping on this or anything, I was mostly just confused because I'd never heard that usage before, and it also conflicted with the Math-specific jargon usage of the term I'm also used to.
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