I would ask for clarification about the rules - it isn't clear to me whether code that is special cased for the known 400 place names (even if it supports additional names via a slower path) would be considered valid:

> Q: Can I make assumptions on the names of the weather stations showing up in the data set?

> A: No, while only a fixed set of station names is used by the data set generator, any solution should work with arbitrary UTF-8 station names (for the sake of simplicity, names are guaranteed to contain no ; character).