question: Did M1 employ M2 , employ M3 , and employ M0 's sequel 's cinematographer
query: SELECT count(*) WHERE {
  ?x0 ns:film.cinematographer.film ?x1 .
  ?x1 ns:film.film.prequel M0 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person M3
  }