question: Was a film distributor whose employee was employed by M0 and was employed by M1 and M2 M3
query: SELECT count(*) WHERE {
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
  M3 a ns:film.film_distributor .
  M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
  }