Was M6 directed by a Japanese screenwriter that was employed by M1 , M2 , M3 , and M4
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M4 .
?x0 ns:people.person.nationality ns:m.03_3d .
M6 ns:film.film.directed_by ?x0
}