Was M3 a film whose sequel was executive produced by M2 and starred M0 and M1
SELECT count(*) WHERE {
?x0 ns:film.film.executive_produced_by M2 .
?x0 ns:film.film.starring/ns:film.performance.actor M0 .
?x0 ns:film.film.starring/ns:film.performance.actor M1 .
M3 a ns:film.film .
M3 ns:film.film.sequel ?x0
}