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