Who edited M1 , directed M3 , wrote M4 's prequel , and wrote M2
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:people.person .
?x0 ns:film.director.film M3 .
?x0 ns:film.editor.film M1 .
?x0 ns:film.writer.film ?x1 .
?x0 ns:film.writer.film M2 .
?x1 ns:film.film.sequel M4
}