question: Did a film star a film editor and star M1
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  ?x0 ns:film.film.starring/ns:film.performance.actor ?x1 .
  ?x0 ns:film.film.starring/ns:film.performance.actor M1 .
  ?x1 a ns:film.editor
  }