Were M4 and M6 employed by M5 and employed by a film distributor that M1 , M2 , and M3 were employed by
SELECT count(*) WHERE {
?x0 a ns:film.film_distributor .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
M4 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M4 ns:people.person.employment_history/ns:business.employment_tenure.company M5 .
M6 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M6 ns:people.person.employment_history/ns:business.employment_tenure.company M5
}