Did a employee of M0 and M1 play M2
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.character M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1
}