Try to guess 20 first level administrative subdivision capitals (both in Slovakia and other countries) closest to Trnava.
For practical reasons, I'll make some exceptions:
In Slovenia and Northern Macedonia, only largest citiy in every statistical region is included.
In Luxembourg, Liechtenstein, San Marino and Andorra only country capital and largest municipality seat are included.
If some subdivision capitals should be included, but are missing, please let me know in the comments.
If speakers of Russian, Belarusian, Ukrainian and Bulgarian languages consider I should include different transliteration of cyrillic names, please let me know.