Question: Give the name of the  managers of England national under-20 football team and England national under-21 football team?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
SELECT DISTINCT ?uri WHERE { ?uri prop:managerclubs <http://dbpedia.org/resource/England_national_under-20_football_team> . ?uri prop:managerclubs <http://dbpedia.org/resource/England_national_under-21_football_team> . }