The last good Dune novel is…
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none of them is good
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Dune
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Dune Messiah
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Children of Dune
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God Emperor of Dune
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Heretics of Dune
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Chapterhouse: Dune
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one of the Prelude to Dune trilogy
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one of the Legends to Dune trilogy
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one of the two sequels
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one of the interludes (Heroes of Dune)
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some other future book
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what's Dune?