List all the co-founders of the non-profit organisations which have founding member as David pressman?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/foundedBy> <http://dbpedia.org/resource/David_Pressman> . ?x <http://dbpedia.org/ontology/foundedBy> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Non-ProfitOrganisation>}
David_Pressman