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    "# Prime pair sets (Euler Problem 60)"
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    "[https://projecteuler.net/problem=60](https://projecteuler.net/problem=60)\n",
    "\n",
    "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.\n",
    "\n",
    "Find the lowest sum for a set of five primes for which any two primes concatenate to produce another prime.\n"
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