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A short story by Raymond Smullyan based on demonstrating unusual versions of Knights and Knaves. Two travellers visit a sorcerer on an island where everyone either always tells the truth or always lies. The sorcerer tells them a story, supposedly from The Thousand And One Nights, of a man attempting to get a king's permission to marry his unmarried daughter by solving various puzzles set by the king involving his two daughters, one of whom never lies and the other of whom never tells the truth.

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