question: Were M2 and M7 written by M3 , M4 , M5 , and M6 and produced by a Canadian actor 's employer
query: SELECT count(*) WHERE {
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
  ?x1 a ns:film.actor .
  ?x1 ns:people.person.nationality ns:m.0d060g .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M2 ns:film.film.written_by M3 .
  M2 ns:film.film.written_by M4 .
  M2 ns:film.film.written_by M5 .
  M2 ns:film.film.written_by M6 .
  M7 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M7 ns:film.film.written_by M3 .
  M7 ns:film.film.written_by M4 .
  M7 ns:film.film.written_by M5 .
  M7 ns:film.film.written_by M6
  }