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Six degrees of separation is the theory that anyone on earth can be connected to any other person on the planet through a chain of acquaintances that has no more than four intermediaries. The theory was first proposed in 1929 by the Hungarian writer Frigyes Karinthy in a short story called Chains. The concept is based on the idea that the number of acquaintances grows exponentially with the number of links in the chain, and so only a small number of links is required for the set of acquaintances to become the whole human population.
[Wikipedia]

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