Did M3 star a actor that M1 and M2 starred , star M4 , and star M5
SELECT count(*) WHERE {
?x0 a ns:film.actor .
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x0 ns:film.actor.film/ns:film.performance.film M2 .
M3 ns:film.film.starring/ns:film.performance.actor ?x0 .
M3 ns:film.film.starring/ns:film.performance.actor M4 .
M3 ns:film.film.starring/ns:film.performance.actor M5
}