What is the {sub-orbital spaceflight} for {astronaut mission} of {Alan Shepard}
Which is the sub-orbital spaceflight for Astronaut Alan Shepard?
 select distinct ?obj where { wd:Q174979 wdt:P450 ?obj . ?obj wdt:P31 wd:Q832435 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q174979> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P450> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q832435> } 
Which is the sub-orbital spaceflight for Space explorer Alan Shepard?