question: Was a cinematographer influenced by M2 and influenced by M3 a screenwriter
query: SELECT count(*) WHERE {
  ?x0 a ns:film.cinematographer .
  ?x0 a ns:film.writer .
  ?x0 ns:influence.influence_node.influenced_by M2 .
  ?x0 ns:influence.influence_node.influenced_by M3
  }