Question: What country with the capital of Luanda conducts trade with SOuth Africa?
Answer(s):
answer: Angola

SPARQL query:
#MANUAL SPARQL
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x 
WHERE {
	FILTER (?x != ns:m.0hzlz)
	{ 
	  ns:m.0hzlz ns:location.statistical_region.places_exported_to ?y .
	  ?y ns:location.imports_and_exports.exported_to ?x . 
	}
	UNION
	{
	  ns:m.0hzlz ns:location.statistical_region.places_imported_from ?y .
	  ?y ns:location.imports_and_exports.imported_from ?x . 
	}?x ns:location.country.capital ns:m.04nsy . 
}