Did M2 and M3 edit M0 's prequel and direct M1 's prequel
SELECT count(*) WHERE {
?x0 ns:film.film.sequel M0 .
?x1 ns:film.film.sequel M1 .
M2 ns:film.director.film ?x1 .
M2 ns:film.editor.film ?x0 .
M3 ns:film.director.film ?x1 .
M3 ns:film.editor.film ?x0
}