Did a Spanish film editor that M2 and M3 were written by edit M1
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.editor.film M1 .
?x0 ns:film.writer.film M2 .
?x0 ns:film.writer.film M3 .
?x0 ns:people.person.nationality ns:m.06mkj
}