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Scottish author Irvine Welsh is renowned for his gritty and humorous portrayal of Edinburgh's working-class culture. His most famous work, "Trainspotting," explores the lives of heroin addicts in the city. Welsh's writing style is characterized by its use of vernacular language and dark humor. He has also written several other novels, including "Marabou Stork Nightmares" and "The Bedroom Secrets of the Master Chefs."