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