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For those who care for stuff like this:

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In the first sentence 'book' refers to a literary work, one that's been with us for over a hundred years. In the second sentence 'book' now refers to a physical object that's probably been around for a lot less. I can easily destroy the latter in my fire, but the former isn't touched by my flames and will doubtless last longer than I will. I can put the former on my hard disk with many siblings that collectively weigh less than the latter.
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