Was a Mexican actor of M4 employed by M0 and employed by M1 and M2
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.character M4 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.nationality ns:m.0b90_r
}