Question: Who influenced both Frank Lloyd Wright and George MacDonald?
Answer(s):
answer: Henry David Thoreau

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.02wlk)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.02wlk ns:influence.influence_node.influenced_by ?x .
?x ns:influence.influence_node.influenced ns:m.012qwm . 
}