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