question: Was M5 edited by a film editor that M1 , M2 , M3 , and M4 employed and edited by M6 and M7
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M4 .
  M5 ns:film.film.edited_by ?x0 .
  M5 ns:film.film.edited_by M6 .
  M5 ns:film.film.edited_by M7
  }