What person whose country of nationality employed M3 and employed M4 played M1 and M2
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:people.person .
?x0 ns:film.actor.film/ns:film.performance.character M1 .
?x0 ns:film.actor.film/ns:film.performance.character M2 .
?x0 ns:people.person.nationality ?x1 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M4
}