Przepraszam, uczę się polskiego. Moje słownictwo jest małe i potrzebuję praktyki.

A relative listed “FSes.-sl” as a language he was fluent in. Does anyone know what this means? It is not on his “duplicate” card. He was born in kol Dąbrowa, Kniahinin, Dubno. Here is a link if I am reading it wrong ...