question: Did M0 's Canadian writer influence a film editor and influence M1 and M2
query: SELECT count(*) WHERE {
  ?x0 ns:film.writer.film M0 .
  ?x0 ns:influence.influence_node.influenced ?x1 .
  ?x0 ns:influence.influence_node.influenced M1 .
  ?x0 ns:influence.influence_node.influenced M2 .
  ?x0 ns:people.person.nationality ns:m.0d060g .
  ?x1 a ns:film.editor
  }