Did M1 employ M0 's sequel 's writer and editor
SELECT count(*) WHERE {
?x0 ns:film.editor.film ?x1 .
?x0 ns:film.writer.film ?x1 .
?x1 ns:film.film.prequel M0 .
M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}