question: Was a art director influenced by a director of M2 and M3 and influenced by M1
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film_art_director .
  ?x0 ns:influence.influence_node.influenced_by ?x1 .
  ?x0 ns:influence.influence_node.influenced_by M1 .
  ?x1 ns:film.director.film M2 .
  ?x1 ns:film.director.film M3
  }