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http://www.chiark.greenend.org.uk/~sgtatham/puzzles/puzzles.tar.gz
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Portions copyright Richard Boulton, James Harvey, Mike Pinna, Jonas
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Kölker, Dariusz Olszewski, Michael Schierl, Lambros Lambrou and
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation files