Question: Which country is the birth place of Marcus Samuelsson and Samuel of Waldebba ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Marcus_Samuelsson> <http://dbpedia.org/property/birthPlace> ?uri. <http://dbpedia.org/resource/Samuel_of_Waldebba> <http://dbpedia.org/property/placeOfBirth> ?uri}