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9 Cities tops
Sorry, but for non-bottom level regions (i.e. regions containing other regions) we have a standing rule here on en-WV that there are to be no more than 9 cities listed in the cities section. Now which cities are to be listed is of course subject to consensus on the talk page and if you want to replace e.g. one listed at Baden Württemberg, you can argue your case on the talk page.