Was M2 's writer and editor a character that edited and wrote M1
SELECT count(*) WHERE {
?x0 a ns:fictional_universe.fictional_character .
?x0 ns:film.editor.film M1 .
?x0 ns:film.editor.film M2 .
?x0 ns:film.writer.film M1 .
?x0 ns:film.writer.film M2
}