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