Was M2 employed by M0 's employer , employed by M3 and M4 , and employed by a production company
SELECT count(*) WHERE {
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
?x1 a ns:film.production_company .
M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
M2 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
M2 ns:people.person.employment_history/ns:business.employment_tenure.company M4
}