These are the rules:
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Q: What's your opinion on love triangle plots?
A: It depends. I've seen it done, well. But more often it's done in a way where it's not even really a triangle, and not only is it clear who the author is going to have end up together, but also who they want the readers to want to end up together. And even then they aren't "real" triangles. Because to two (usually boys) who are supposed to be competing for the affection of the one (usually a girl) hate each other.