Was M2 employed by M0 's employer , employed by a production company , and employed by M3
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
}