What is <relative to> of <stack> ?
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Which is relative to the stack?
SELECT DISTINCT ?o WHERE { ?o property:relative_to resource:stack }
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/P2210> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q177929>. }
select distinct ?answer where { ?answer wdt:P2210 wd:Q177929}