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4-way intersection
Four cars are stopped at a 4-way stop sign intersection, each having
come from a different direction. If we don't know who got there first ..
how many cars can enter the intersection at the same time without crashing?

Congratulations to these solvers as of
Juan Allain, Jack Appelmans, Danny Blanco, Robert Escalante,
Brian Foote, Joshua Green, Jestes, Chris Magson, Valmai Osborn,
Nash Singh, Steve Steppe and Jay Willner.

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