Did M2 edit a film 's sequel and prequel and edit a prequel of M0
SELECT count(*) WHERE {
?x0 ns:film.film.sequel M0 .
?x1 ns:film.film.prequel ?x2 .
?x1 ns:film.film.sequel ?x2 .
?x2 a ns:film.film .
M2 ns:film.editor.film ?x0 .
M2 ns:film.editor.film ?x1
}