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Jötunvillur are a set of runic code inscriptions dating back to the Viking age. Although previously untranslatable, a proposed solution to the code was announced by the runologist K Jonas Nordby in 2014.
- Alison Flood (12 Feb 2014). "Ancient Viking code deciphered for the first time". The Guardian.
- Holloway, April. "Medieval Sudoku: Codebreaking Hidden Messages in Viking Runes". Ancient Origins. Retrieved 31 March 2018.
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