Was M3 a costume designer whose employer employed M1 and M2 and was founded by M0
SELECT count(*) WHERE {
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x0 ns:organization.organization.founders M0 .
M3 a ns:film.film_costumer_designer .
M3 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0
}