What is <UGentMemorialis ID> of <Henri Pirenne> ?
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What is in the category of Henri Pirenne?
SELECT DISTINCT ?o WHERE { resource:Henri_Pirenne property:UGentMemorialis_ID ?o }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q312501> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3159> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q312501 wdt:P3159 ?answer}