What is <phase of matter> of <solid> ?
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A solid is what phase of matter?
SELECT DISTINCT ?d WHERE { ?d property:phase_of_matter resource:solid }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P515> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q11438>. }
select distinct ?answer where { ?answer wdt:P515 wd:Q11438}