Was M3 a cinematographer whose employer employed M0 , M1 , and 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 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
M3 a ns:film.cinematographer .
M3 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0
}