Question: How many non-fiction subjects are there of the books whose one of the non-fiction subject is Ankh-Morpork City Watch ?
SPARQL query: SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/nonFictionSubject> <http://dbpedia.org/resource/Ankh-Morpork_City_Watch> . ?x <http://dbpedia.org/ontology/nonFictionSubject> ?uri }
Answer: There are [68] non-fiction subjects of the books whose one of them is Ankh-Morpork City Watch.