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prefix fcrepo: <http://fedora.info/definitions/v4/repository#>
prefix relation: <http://www.iana.org/assignments/relation/>
select ?container where { 
    ?ds fcrepo:mixinTypes "fedora:NonRdfSourceDescription" .
    ?ds fcrepo:hasParent ?objectcontainer . 
    ?ds relation:describes ?content .
    ?content fcrepo:mimeType "application/pdf" 
}