Was a film executive produced by M1 , M2 , M3 , and M4 and executive produced by M5 and M6
SELECT count(*) WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.executive_produced_by M1 .
?x0 ns:film.film.executive_produced_by M2 .
?x0 ns:film.film.executive_produced_by M3 .
?x0 ns:film.film.executive_produced_by M4 .
?x0 ns:film.film.executive_produced_by M5 .
?x0 ns:film.film.executive_produced_by M6
}