question: Who influenced and was influenced by a actor of M1 , M2 , and M3
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:influence.influence_node.influenced ?x1 .
  ?x0 ns:influence.influence_node.influenced_by ?x1 .
  ?x1 ns:film.actor.film/ns:film.performance.character M1 .
  ?x1 ns:film.actor.film/ns:film.performance.character M2 .
  ?x1 ns:film.actor.film/ns:film.performance.character M3
  }