what is the {applies to part} for {Nile} has {origin of the watercourse} as {Lake Tana} ?
Which fork of the Nile originates in Lake Tana?
Which fork of the Nile has its orgins in Lake Tana?
SELECT ?q WHERE { ?c property:origin_of_the_watercourse resource:Lake_Tana . ?c property:applies_to_part ?q . resource:Nile property:origin_of_the_watercourse ?c }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q3392> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P885> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q116685> .
?statement <http://www.wikidata.org/entity/P518> ?value. 
} 

SELECT ?value WHERE { wd:Q3392 p:P885 ?s . ?s ps:P885 wd:Q116685 . ?s pq:P518 ?value}