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Twain originally envisioned the characters of Luigi and Angelo Capello as conjoined twins, modeled after the late-19th century Italian conjoined twins Giovanni and Giacomo Tocci. He planned for them to be the central characters of a novel to be titled Those Extraordinary Twins.During the writing process, however, Twain realized that secondary characters such as Pudd'nhead Wilson, Roxy, and Tom Driscoll were taking a more central role in the story.