question: Was a person influenced by M1 and M2 and influenced by M3 's star and writer
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:influence.influence_node.influenced_by ?x1 .
  ?x0 ns:influence.influence_node.influenced_by M1 .
  ?x0 ns:influence.influence_node.influenced_by M2 .
  ?x1 ns:film.actor.film/ns:film.performance.film M3 .
  ?x1 ns:film.writer.film M3
  }