question: What production company was M1 's employee 's employer
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.production_company .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M1
  }