A "--" in the district column means, that the town is a district-free town, i.e. it is by itself a district.
... type 1[?] Agyrophobia[?] Ahumada-Del Castillo syndrome[?] Aicardi syndrome[?] Aicardi-Goutieres syndrome[?] Aichmophobia[?] AIDS Dementia Complex[?] AIDS ...