London Underground (open) stations grouped by line. Intended to allow you to be able to recall all of the stations, not just remember the lines. Each level represents a line, and each of these tests you on phrases such as "District line 37" ("Mansion House"). The numbers loosely correspond to position, but that's incidental - the point is that they uniquely identify a station so that you can say to yourself "What are all the district line stations? DL1 is Richmond, DL2 is Kew Gardens, ...".
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