question: Was M2 produced by a employer of M0 and M1
query: SELECT count(*) WHERE {
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0
  }