Alice gives Eve a standard deck of 52 cards, out of which Eve chooses 5, which she hands back to Alice. Alice looks at these cards, and chooses 4 of them to give to Bob. She sets these 4 cards face down in a pile, which Bob picks up and examines. Bob then names the card Alice is still holding. How does this trick operate? No sleight of hand or subtle signals are required here; you could write a computer program to implement this strategy successfully.

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