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judk
on May 8, 2014
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Viennese Mazes: What They Are, and How to Make One
One of the example solutions breaks the rule of "only pass a light once"
zulko
on May 8, 2014
[–]
It doesn't say that, it says "twice in a row". This means you cannot half-turn and just go back the street you came from.
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