premise: The 1956 German football championship was the culmination of the football season in West Germany in 1955-56. Borussia Dortmund were crowned champions for the first time in their second final appearance, having previously lost the 1949 German football championship final to VfR Mannheim.
hypothesis: There were seven years between Borussia Dortmund first two championship appearances
reason: It is definitely correct because the article says Borussia Dortmund made their first appearance in 1949 and their second in 1956 (7 years).  It fooled the computer because it had to  make the connections and do the math on this statement.