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