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Why was Paradise Lost revised from 10 books into 12 books?

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Engraved portrait of John Milton by Jacob Houbraken, showing Milton with shoulder-length hair, a lace collar, and period clothing, facing forward in an oval frame. — John Milton John Milton, engraving by Jacob Houbraken, 1741.

Paradise Lost was originally published in 10 books in 1667. For the second edition in 1674, John Milton revised the poem into 12 books by splitting Book 7 and Book 10 each into two separate parts.1