Question: Paul Leonard's work can be divided into how many series?
SPARQL query: SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/author> <http://dbpedia.org/resource/Paul_Leonard_(writer)> . ?x <http://dbpedia.org/ontology/series> ?uri  . }
Answer: There are [18] series of works authored by Paul Leonard.