What was produced by a actor that M1 and M2 starred
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
?x1 a ns:film.actor .
?x1 ns:film.actor.film/ns:film.performance.film M1 .
?x1 ns:film.actor.film/ns:film.performance.film M2
}