Did M3 and M4 produce a film executive produced by M1 and executive produced by M2
SELECT count(*) WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.executive_produced_by M1 .
?x0 ns:film.film.executive_produced_by M2 .
M3 ns:film.producer.film|ns:film.production_company.films ?x0 .
M4 ns:film.producer.film|ns:film.production_company.films ?x0
}