The Sonderausweis SO was a rare variety of the Sonderausweis. Basically the same as the Sonderausweis D, but for purposes of travel to the South East (Süd Ost).
This document has what looks to be many different languages. All of which would be in the South East area.

doc-sonderausweis-so
(Courtesy of Andreas K. Odemer)

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