question: Was a film 's editor employed by M1 's employer and employed by M0
query: SELECT count(*) WHERE {
  ?x0 ns:film.editor.film ?x1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x2 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
  ?x1 a ns:film.film .
  ?x2 ns:business.employer.employees/ns:business.employment_tenure.person M1
  }