question: Were M2 , M4 , and M5 employed by a producer of M1 , employed by M3 , and employed by a film distributor
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film_distributor .
  ?x1 ns:film.producer.film|ns:film.production_company.films M1 .
  M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
  M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  M2 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
  M4 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
  M4 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  M4 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
  M5 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
  M5 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  M5 ns:people.person.employment_history/ns:business.employment_tenure.company M3
  }