Question: Stefan Mokrzecki was once a member of armed forces of what republic that was created in 1920?
Sentence (from "Republic of Central Lithuania"): Centered on the historical capital of the Grand Duchy of Lithuania, Vilna (Lithuanian: "Vilnius" , Polish: "Wilno" ), for eighteen months the entity served as a buffer state between Poland, upon which it depended, and Lithuania, which claimed the area.
Relevant evidence: No