Question: What are the beginning and end dates of the administration of Richard A. Ballinger as mayor of Seattle?
SPARQL (Wikidata): SELECT ?value1 ?value2 WHERE { wd:Q5083 p:P6 ?s . ?s ps:P6 wd:Q952884 . ?s pq:P2031 ?value1 . ?s pq:P2032 ?value2 }