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