question: What actor of M3 's actor did M0 , M1 , and M2 star
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.character ?x1 .
  ?x0 ns:film.actor.film/ns:film.performance.film M0 .
  ?x0 ns:film.actor.film/ns:film.performance.film M1 .
  ?x0 ns:film.actor.film/ns:film.performance.film M2 .
  ?x1 ns:film.actor.film/ns:film.performance.character M3
  }