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The primes 3, 7, 109, and 673, are quite remarkable. By
taking any two primes and concatenating them in any order
the result will always be prime. For example, taking 7 and
109, both 7109 and 1097 are prime. The sum of these four
primes, 792, represents the lowest sum for a set of four
primes with this property. (Project Euler, Problem 60)
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