What is the highschool of the american football player who joined the Robert Morris Colonials program?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/school> <http://dbpedia.org/resource/Robert_Morris_Colonials_football> . ?x <http://dbpedia.org/property/highschool> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/AmericanFootballPlayer>}
Robert_Morris_Colonials_football