question: Was a art director influenced by M2 and M3 , influenced by M4 , and influenced by M5 and M6 a person
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film_art_director .
  ?x0 a ns:people.person .
  ?x0 ns:influence.influence_node.influenced_by M2 .
  ?x0 ns:influence.influence_node.influenced_by M3 .
  ?x0 ns:influence.influence_node.influenced_by M4 .
  ?x0 ns:influence.influence_node.influenced_by M5 .
  ?x0 ns:influence.influence_node.influenced_by M6
  }