Did M1 star M2 , star M3 , and star a editor and star of a film 's prequel
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.film ?x1 .
?x0 ns:film.editor.film ?x1 .
?x1 ns:film.film.sequel ?x2 .
?x2 a ns:film.film .
M1 ns:film.film.starring/ns:film.performance.actor ?x0 .
M1 ns:film.film.starring/ns:film.performance.actor M2 .
M1 ns:film.film.starring/ns:film.performance.actor M3
}