Question: Which admin center of pulau Ujong is also the largest city of Pulau Ubin ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Pulau_Ubin> <http://dbpedia.org/ontology/largestCity> ?uri. <http://dbpedia.org/resource/Pulau_Ujong> <http://dbpedia.org/ontology/capital> ?uri}