Where did Doug Walgren and Lee Si Chen study?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Lee_Si-Chen> <http://dbpedia.org/property/almaMater> ?uri. <http://dbpedia.org/resource/Doug_Walgren> <http://dbpedia.org/ontology/almaMater> ?uri . }
Lee_Si-Chen Doug_Walgren