question: Who was a film producer that influenced M2 's Canadian writer and was influenced by a film producer
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.producer .
  ?x0 a ns:people.person .
  ?x0 ns:influence.influence_node.influenced ?x1 .
  ?x0 ns:influence.influence_node.influenced_by ?x2 .
  ?x1 ns:film.writer.film M2 .
  ?x1 ns:people.person.nationality ns:m.0d060g .
  ?x2 a ns:film.producer
  }