What is <by-product of> of <combustion> ?
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What is the by-product of combustion?
SELECT DISTINCT ?a WHERE { ?a property:by-product_of resource:combustion }
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/P2822> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q133235>. }
select distinct ?answer where { ?answer wdt:P2822 wd:Q133235}
ash