machine_question: what guitar did the person who wrote the lyrics for "Pen Cap Chew"
question: What is the guitar preference for the lyricist who wrote "Pen Cap Chew?"?
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:music.lyricist.lyrics_written ns:m.0d5g5l . 
  ?c ns:music.guitarist.guitars_played ?x .
  }
  
webqsp_question: what guitar did kurt cobain