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The answer is a diarist. Anaïs Nin was a French-born American diarist, novelist, and short story writer. She is best known for her published diaries, which span over 60 years and amount to more than 35,000 pages. Nin's diaries provide an intimate and introspective account of her personal life, relationships, and artistic development. Her work has been widely praised for its honesty, insight, and exploration of female sexuality.