question: Who executive produced M1 , executive produced M4 's sequel , and directed M2 and M3
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:film.director.film M2 .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:film.producer.films_executive_produced ?x1 .
  ?x0 ns:film.producer.films_executive_produced M1 .
  ?x1 ns:film.film.prequel M4
  }