Was M2 employed by M3 and M4 , employed by a company , and employed by a production company
SELECT count(*) WHERE {
?x0 a ns:film.production_company .
?x1 a ns:business.employer .
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
}