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Leonid Gaidai was a Russian film director, screenwriter, and actor. He is best known for his comedies, such as The Diamond Arm (1968), Operation Y and Shurik's Other Adventures (1965), and The Twelve Chairs (1971). Gaidai's films were characterized by their satirical humor, slapstick comedy, and visual gags. He is considered one of the most influential directors in Russian cinema.