Was M1 produced by and written by a film 's sequel 's editor
SELECT count(*) WHERE {
?x0 ns:film.editor.film ?x1 .
?x1 ns:film.film.prequel ?x2 .
?x2 a ns:film.film .
M1 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
M1 ns:film.film.written_by ?x0
}