(There's also a fourth category—the pseudo-pseudonymous, people who use pen names but are open about who they really are, like mystery author Ruth Rendell, whose romance books say "By RUTH RENDELL writing as Barbara Vine" on the cover—or like Klein, whose future political novels won't be hard to spot as his. Pseudo-pseudonymous people are like librarians who tell you within five minutes of meeting you that they're heavily into latex. No mystery. No fun. If you're going to lead a double life, lead a double life, okay?)
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