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Rekha has starred in many Hindi films, but she has also ventured into the parallel cinema. Parallel cinema is a type of Indian cinema that is made outside the mainstream film industry and is typically more experimental and artistic. Rekha's work in parallel cinema includes films such as "Manthan" (1976), "Aakrosh" (1980), and "Umrao Jaan" (1981). Her performance in "Umrao Jaan" earned her the National Film Award for Best Actress.