banned combinations include the nazi abbreviations hj ("hitlerjugend", hitler youth), ns ("nationalsozialismus", national socialism), sa ("sturmabteilung"), ss ("schutzstaffel") and kz ("konzentrationslager", concentration camp). some registration offices have overlooked this rule by mistake, however; there are a few automobiles registered carrying prohibited codes, such as "b-ss 12". some counties also allow these combinations if they are the initials of the owner (e.g., norbert schmidt might be able to get xx-ns 1234), but in this case, if the automobile is sold and re-registered in the same county by the new owner, the number can be changed (otherwise the number stays with the automobile until it registered in a different area).