Who has been married to both Penny Lancaster and Alana Stewart?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Penny_Lancaster> <http://dbpedia.org/ontology/spouse> ?uri. <http://dbpedia.org/resource/Alana_Stewart> <http://dbpedia.org/ontology/spouse> ?uri . }
Penny_Lancaster Alana_Stewart