Question: How many molluscas are there whose families are Buccinidae and Buccinoidea?
SPARQL:
 SELECT DISTINCT COUNT(?uri) WHERE { ?uri <http://dbpedia.org/ontology/family> <http://dbpedia.org/resource/Buccinidae> . ?uri <http://dbpedia.org/ontology/family> <http://dbpedia.org/resource/Buccinoidea>}