Question: Which office holder's  military branch is Continental Army and vice president is John Adams?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri onto:militaryBranch <http://dbpedia.org/resource/Continental_Army> . ?uri onto:vicePresident <http://dbpedia.org/resource/John_Adams> . ?uri rdf:type onto:OfficeHolder}