Did M2 employ M3 , employ M0 's American writer , and employ M4
SELECT count(*) WHERE {
?x0 ns:film.writer.film M0 .
?x0 ns:people.person.nationality ns:m.09c7w0 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person M4
}