Five thousand of the 50,000 books published in country Z in 1991 were novels. ███████ ██ ██ ███ █████ ████████ ██ ███████ █ ██ ████ ████ █████ ██ █████ ███████ █████ ███ █████ ████ ████████ ██ ███████ █ ██ █████ ██ ████ ████ ███████████ ██ ████ ████ █████ ██ █████ █████████ ██ ███████ █ ██ █████
The author concludes that at most 25% of the films released in 1992 were based on books published in 1991. His reasoning is that 25% of the films released in 1992 were based on novels published in 1991.
The author’s conclusion is about books, but his premise is about novels. What if there were movies based on books (e.g. biographies) that aren’t novels? We need to close this gap in the argument. We could do so by adding the assumption that all movies released in 1992 that were based on 1991 books were based on novels.
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