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Really makes you think. And think. And think...
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"Permutation City" is one of those gedanken experiments which screws hard with your brain if you invest more than 5 minutes thinking about it. It's not the masterpiece of novels, and some of the characters have shallow roles and are there because god-knows-why. However, the author's style is pleasant and his hypothesis is very sound. It's a fair trade-off if you are into the hard sci-fi genre; a trade-off which is better digested with alcohol ?