Did M1 , M2 , and M3 write and edit a sequel of M0
SELECT count(*) WHERE {
?x0 ns:film.film.prequel M0 .
M1 ns:film.editor.film ?x0 .
M1 ns:film.writer.film ?x0 .
M2 ns:film.editor.film ?x0 .
M2 ns:film.writer.film ?x0 .
M3 ns:film.editor.film ?x0 .
M3 ns:film.writer.film ?x0
}