Question: Which trading partner country of Portugal has Power plug Type F plugs?
Answer(s):
answer: Algeria

SPARQL query:
#MANUAL SPARQL
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x 
WHERE {
	FILTER (?x != ns:m.05r4w)
	{ 
	  ns:m.05r4w ns:location.statistical_region.places_exported_to ?y .
	  ?y ns:location.imports_and_exports.exported_to ?x . 
	}
	UNION
	{
	  ns:m.05r4w ns:location.statistical_region.places_imported_from ?y .
	  ?y ns:location.imports_and_exports.imported_from ?x . 
	}?x ns:engineering.location_with_mains_power.mains_power_standards ?c .
?c ns:engineering.mains_power.compatible_plugs ns:m.08ny25y . 
}