Was M2 produced by a person that M1 was executive produced by and starred
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x0 ns:film.producer.films_executive_produced M1 .
M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0
}