What is <highway system> of <controlled-access highway> ?
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The controlled-access highway is part of what highway system?
SELECT DISTINCT ?c WHERE { ?c property:highway_system resource:controlled-access_highway }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P16> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q46622>. }
select distinct ?answer where { ?answer wdt:P16 wd:Q46622}
Sha Tin Road Sha Lek Highway