What character was employed by a employer of M1 and M2
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:fictional_universe.fictional_character .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M2
}