Question: What was the abbreviation for the Sakha Republic on December 12, 1991?
Paraphrase: On December 12, 1991, what was the initialism of Sakha Republic?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q6605 p:P1813 ?s . ?s ps:P1813 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1991')) }