Was a writer of M1 , M2 , and M3 a film editor employed by M4
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.writer.film M1 .
?x0 ns:film.writer.film M2 .
?x0 ns:film.writer.film M3 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M4
}