Was M1 edited by M2 , edited by M0 's editor and star , and edited by M3
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.film M0 .
?x0 ns:film.editor.film M0 .
M1 ns:film.film.edited_by ?x0 .
M1 ns:film.film.edited_by M2 .
M1 ns:film.film.edited_by M3
}