Was M0 's employer M1 's Mexican executive producer 's employer
SELECT count(*) WHERE {
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
?x1 ns:film.producer.films_executive_produced M1 .
?x1 ns:people.person.nationality ns:m.0b90_r
}