I guess actually all time zones become adjacent at the poles. (Excluding +13, +14, and fractional zones.) Whatever. That doesn't count.
@Sniffnoy Adjacent time zones would still be adjacent, assuming one edge is closed and the other open.
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@InstanceOfClass Sure, but then you're using more info than just the sets; you've picked edges. At which point, why bother with constraints? -
@Sniffnoy By edge, I mean part of the boundary of the set. There is no extra information. - 5 more replies
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