Did M2 , M3 , M4 , M5 , and M6 employ a Mexican screenwriter
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x0 ns:people.person.nationality ns:m.0b90_r .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M4 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M5 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M6 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}