What is <has part> of <Indian Ocean> ?
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Which means{has part}  from {Indian Ocean} ?
SELECT DISTINCT ?v WHERE { resource:Indian_Ocean property:has_part ?v }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1239> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P527> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q1239 wdt:P527 ?answer}
Bay of Bengal Arabian Sea