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PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX ro: <http://purl.obolibrary.org/obo/RO_>
PREFIX tax: <http://purl.obolibrary.org/obo/NCBITaxon_>
PREFIX iao: <http://purl.obolibrary.org/obo/IAO_>
PREFIX isa: <http://purl.org/isaterms/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX obi: <http://purl.obolibrary.org/obo/OBI_>
SELECT DISTINCT ?factor ?factor_level
WHERE
{ ?study_design rdf:type isa:study_design .
?study_design isa:declares ?factor_iri .
?factor_iri rdfs:label ?factor .
?factor_iri isa:has_factor_level ?factor_level_iri .
?factor_level_iri rdfs:label ?factor_level
}