question: Who executive produced a film and edited a prequel of M1 's sequel
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:film.editor.film ?x1 .
  ?x0 ns:film.producer.films_executive_produced ?x2 .
  ?x1 ns:film.film.sequel ?x3 .
  ?x2 a ns:film.film .
  ?x3 ns:film.film.prequel M1
  }