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