Were M1 , M2 , M3 , M4 , M5 , M6 , and M7 employed by a film producer
SELECT count(*) WHERE {
?x0 a ns:film.producer .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M3 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M4 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M5 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M6 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M7 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0
}