machine_question: when was the person that said "I destroy my enemy when I make him my friend." president
question: What years was the person who said "I destroy my enemy when I make him my friend." President?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ?c)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ?c ns:people.person.quotations ns:m.048cz_5 . 
  ?c ns:base.inaugurations.inauguration_speaker.inauguration ?x .
  }
  
webqsp_question: when was abe lincoln president