Question: Which college has been attended  by both Mr. Hubert Wiggs and Mr. Alvin Bell?
SPARQL:
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Hubert_Wiggs> <http://dbpedia.org/ontology/college> ?uri. <http://dbpedia.org/resource/Alvin_Bell> <http://dbpedia.org/ontology/college> ?uri . }