Were M1 , M2 , and M3 executive produced by M0 's employee
SELECT count(*) WHERE {
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
M1 ns:film.film.executive_produced_by ?x0 .
M2 ns:film.film.executive_produced_by ?x0 .
M3 ns:film.film.executive_produced_by ?x0
}