City search data: GeoNames (https://www.geonames.org/).
Source: https://download.geonames.org/export/dump/cities500.zip
License: Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/
NAVEO modifications: normalized names, filtered aliases, country aggregation,
population ranking and hash-based partitioning. No accuracy/completeness warranty.