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