Did M2 , M3 , and M4 write a film executive produced by M1
SELECT count(*) WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.executive_produced_by M1 .
M2 ns:film.writer.film ?x0 .
M3 ns:film.writer.film ?x0 .
M4 ns:film.writer.film ?x0
}