Question: What countries bordering Greece did the speaker Gregor Belkovsky talk about?
Answer(s):
answer: Bulgaria

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.035qy)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.035qy ns:location.location.adjoin_s ?y .
?y ns:location.adjoining_relationship.adjoins ?x .
?x ns:common.topic.notable_types ns:m.01mp .
?x ns:event.speech_topic.speeches_or_presentations_on_this_topic ?c .
?c ns:event.speech_or_presentation.speaker_s ns:m.08ngt59 . 
}