What is {educated at} of {Lujo Brentano} that is {student of} is {Johann von Helferich} ?
Where was Lujo Brentano a student of Johann von Helferich?
SELECT ?obj WHERE { wd:Q62830 p:P69 ?s . ?s ps:P69 ?obj . ?s pq:P1066 wd:Q5798542 }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q62830> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P69> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P1066> <http://wikidata.dbpedia.org/resource/Q5798542>
} 

In what location was Lujo Brentano a student of Johann von Helferich?