One of the example solutions breaks the rule of "only pass a light once" | Hacker News

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		judk on May 8, 2014 \| parent \| context \| favorite \| on: 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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