Round trip

      The only solution is 1 - 2 - 3 - 7 - 8 - 9 - 4 - 5 - 10 - 15 - 14 - 19 - 20 - 25 - 24 - 23 - 22 - 21 - 16 - 11 - 17 - 18 - 13 - 12 - 6 - 1.

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