question: Was M1 employed by a film producer and employed by a film producer
query: SELECT count(*) WHERE {
  ?x0 a ns:film.producer .
  ?x1 a ns:film.producer .
  M1 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
  M1 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1
  }