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Do you need a work permit? normal dose of lexapro for ocd To be fair, it took a group of experts in forensic linguistics to help establish that The Cuckoo’s Calling had been written by Rowling. Patrick Juola, a professor of computer science at Pittsburgh’s Duquesne University, was one of those called in to compare the text with The Casual Vacancy, Rowling’s first adult novel, published last year, and with works by Ruth Rendell, PD James and McDermid. Using various software programs, Juola looked for authorial fingerprints by highlighting the most frequently used words. “Prepositions and articles and similar little function words are actually very individual,” Juola told Time magazine. “It’s actually very, very hard to change them because they’re so subconscious.”