Were M2 , M3 , M4 , M5 , M6 , and M7 directed by a film editor that directed M1
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.director.film M1 .
M2 ns:film.film.directed_by ?x0 .
M3 ns:film.film.directed_by ?x0 .
M4 ns:film.film.directed_by ?x0 .
M5 ns:film.film.directed_by ?x0 .
M6 ns:film.film.directed_by ?x0 .
M7 ns:film.film.directed_by ?x0
}