question: Were M5 , M6 , and M7 directed by a actor that M1 and M2 employed and M3 and M4 employed
query: SELECT count(*) WHERE {
  ?x0 a ns:film.actor .
  ?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.directed_by ?x0 .
  M6 ns:film.film.directed_by ?x0 .
  M7 ns:film.film.directed_by ?x0
  }