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Population of the UK split into 4 equal quarters
(sopuli.xyz)
For the map enthused!
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post relevant content: interesting, informative, and/or pretty maps
be nice
In that description, the two lines wouldn't necessarily be perpendicular.
Edit: I mean that if you're trying to apply the same mechanism to the second line, you wouldn't necessarily end up with the lines intersecting at 90°. But maybe I'm misunderstanding.