Sanation (Polish: "Sanacja" , ] ) was a Polish political movement that was created in the interwar period, prior to Józef Piłsudski's May 1926 "Coup d'État", and came to power in the wake of that coup. In 1928 its political activists would go on to form the Nonpartisan Bloc for Cooperation with the Government (""BBWR"").
Sanacja may well have been created in a leap year
As it was created some time between 1918 and 1926, there are two possible leap years it may have been created. Fooled as there is ambiguous language with "may have"