SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/assembly> <http://dbpedia.org/resource/Canada> . ?x <http://dbpedia.org/ontology/predecessor> ?uri . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Automobile>}
What cars were built upon the cars which were assembled in Canada?
SELECT DISTINCT ?b WHERE { ?n property:predecessor ?b . ?n property:assembly resource:Canada . ?n rdf:type ontology:Automobile }
answer
The predecessors of the automobiles assembled in Canada are [answer].
The predecessors of cars assembled in Canada are [answer].