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Goodreads asked Carole T. Beers:

Who is your favorite fictional couple, and why?

Carole T. Beers Oooh, great question. Rhett and Scarlett are right up there. I assume you mean "romantic" couple! Rebecca and de Winter. Jay Gatsby and Daisy Buchanan. Florentino Ariza and Fermina Daza ("Love in the Time of Cholera").
As for non-romantic couples? Atticus Finch and his daughter Scout in "To Kill a Mockngbird." Alex and The Black in all the Black Stallion books! Love a good human-horse partnership.

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