Did M2 employ M3 , employ M1 's employee , employ M4 , and employ a executive producer of M0
SELECT count(*) WHERE {
?x0 ns:film.producer.films_executive_produced M0 .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person M4
}