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Str8ts: Der Sudoku-Nachfolger. 100 Str8ts in verschiedenen Schwierigkeitsstufen: 9783866158108 - AbeBooks
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Str8ts Sudoku Variations: Medium & Hard Leveled Straights Puzzles: Amazon.co.uk: Ketschik, Emil: 9798396321762: Books
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PDF) Indispensable Numbers in Str8ts as a Generalization of the Clan Concept in Sudoku | Michael Mrva - Academia.edu
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