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Published at 643 × 654 in A tale of $n$ cities
A diagram with four "cities", arranged in a square and labelled k_1, k_2, k_3, k_4, with "edges" of different widths between each pair.

The six routes in the tale of four cities and their respective counts of pen pal pairs

Clare (like gare) is a Chalkdust editor. In her spare time, she’s an assistant professor at Durham University. She likes Skittles, probability, and making the magazine look more like Cosmo.
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