What is {work period (end)} and {work period (start)} of {{Seattle} has {head of government} as {Arthur B. Langlie}}
When did Arthur B. Langlie turn out to be Seattle's head of government and when did he stop?
When did Arthur B. Langlie become Seattle's head of government and when did he stop?
SELECT ?k ?l WHERE { ?a property:work_period_(start) ?l . ?a property:work_period_(end) ?k . ?a property:head_of_government resource:Arthur_B._Langlie . resource:Seattle property:head_of_government ?a }
select distinct ?value1 ?value2 where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q5083> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P6> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q371494>. ?statement <http://www.wikidata.org/entity/P580> ?value1 . ?statement <http://www.wikidata.org/entity/P2842> ?value2 } 
SELECT ?value1 ?value2 WHERE { wd:Q5083 p:P6 ?s . ?s ps:P6 wd:Q371494 . ?s pq:P2032 ?value1 . ?s pq:P2031 ?value2 }