question: Was M3 a British female screenwriter 's employer
query: SELECT count(*) WHERE {
  ?x0 a ns:film.writer .
  ?x0 ns:people.person.gender ns:m.02zsn .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
  }