Was M3 produced by a German screenwriter that directed and edited M1
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x0 ns:film.director.film M1 .
?x0 ns:film.editor.film M1 .
?x0 ns:people.person.nationality ns:m.0345h .
M3 ns:film.film.produced_by|ns:film.film.production_companies ?x0
}